arrow-select 60.0.0

// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

//! Defines take kernel for [Array]

use std::fmt::Display;
use std::mem::ManuallyDrop;
use std::sync::Arc;

use arrow_array::builder::UInt32Builder;
use arrow_array::cast::AsArray;
use arrow_array::types::*;
use arrow_array::*;
use arrow_buffer::{
    ArrowNativeType, BooleanBuffer, Buffer, MutableBuffer, NullBuffer, NullBufferBuilder,
    OffsetBuffer, RunEndBuffer, ScalarBuffer, bit_util,
};
use arrow_cmp::make_comparator;
use arrow_data::{ArrayData, transform::MutableArrayData};
use arrow_schema::{ArrowError, DataType, FieldRef, SortOptions, UnionFields, UnionMode};

use num_traits::{CheckedAdd, Zero};

/// Take elements by index from [Array], creating a new [Array] from those indexes.
///
/// ```text
/// ┌─────────────────┐      ┌─────────┐                              ┌─────────────────┐
/// │        A        │      │    0    │                              │        A        │
/// ├─────────────────┤      ├─────────┤                              ├─────────────────┤
/// │        D        │      │    2    │                              │        B        │
/// ├─────────────────┤      ├─────────┤   take(values, indices)      ├─────────────────┤
/// │        B        │      │    3    │ ─────────────────────────▶   │        C        │
/// ├─────────────────┤      ├─────────┤                              ├─────────────────┤
/// │        C        │      │    1    │                              │        D        │
/// ├─────────────────┤      └─────────┘                              └─────────────────┘
/// │        E        │
/// └─────────────────┘
///    values array          indices array                              result
/// ```
///
/// For selecting values by index from multiple arrays see [`crate::interleave`]
///
/// Note that this kernel, similar to other kernels in this crate,
/// will avoid allocating where not necessary. Consequently
/// the returned array may share buffers with the inputs
///
/// # Errors
/// This function errors whenever:
/// * An index cannot be casted to `usize` (typically 32 bit architectures)
/// * An index is out of bounds and `options` is set to check bounds.
///
/// # Panics
///
/// When `options` is not set to check bounds, taking indexes after `len` will panic.
///
/// # See also
/// * [`BatchCoalescer`]: to filter multiple [`RecordBatch`] and coalesce
///   the results into a single array.
///
/// [`BatchCoalescer`]: crate::coalesce::BatchCoalescer
///
/// # Examples
/// ```
/// # use arrow_array::{StringArray, UInt32Array, cast::AsArray};
/// # use arrow_select::take::take;
/// let values = StringArray::from(vec!["zero", "one", "two"]);
///
/// // Take items at index 2, and 1:
/// let indices = UInt32Array::from(vec![2, 1]);
/// let taken = take(&values, &indices, None).unwrap();
/// let taken = taken.as_string::<i32>();
///
/// assert_eq!(*taken, StringArray::from(vec!["two", "one"]));
/// ```
pub fn take(
    values: &dyn Array,
    indices: &dyn Array,
    options: Option<TakeOptions>,
) -> Result<ArrayRef, ArrowError> {
    let options = options.unwrap_or_default();
    downcast_integer_array!(
        indices => {
            let indices = indices.to_indices();
            if options.check_bounds {
                check_bounds(values.len(), &indices)?;
            }
            take_impl::<_, true>(values, &indices)
        },
        d => Err(ArrowError::InvalidArgumentError(format!("Take only supported for integers, got {d:?}")))
    )
}

/// For each [ArrayRef] in the [`Vec<ArrayRef>`], take elements by index and create a new
/// [`Vec<ArrayRef>`] from those indices.
///
/// ```text
/// ┌────────┬────────┐
/// │        │        │           ┌────────┐                                ┌────────┬────────┐
/// │   A    │   1    │           │        │                                │        │        │
/// ├────────┼────────┤           │   0    │                                │   A    │   1    │
/// │        │        │           ├────────┤                                ├────────┼────────┤
/// │   D    │   4    │           │        │                                │        │        │
/// ├────────┼────────┤           │   2    │  take_arrays(values,indices)   │   B    │   2    │
/// │        │        │           ├────────┤                                ├────────┼────────┤
/// │   B    │   2    │           │        │  ───────────────────────────►  │        │        │
/// ├────────┼────────┤           │   3    │                                │   C    │   3    │
/// │        │        │           ├────────┤                                ├────────┼────────┤
/// │   C    │   3    │           │        │                                │        │        │
/// ├────────┼────────┤           │   1    │                                │   D    │   4    │
/// │        │        │           └────────┘                                └────────┼────────┘
/// │   E    │   5    │
/// └────────┴────────┘
///    values arrays             indices array                                      result
/// ```
///
/// # Errors
/// This function errors whenever:
/// * An index cannot be casted to `usize` (typically 32 bit architectures)
/// * An index is out of bounds and `options` is set to check bounds.
///
/// # Panics
///
/// When `options` is not set to check bounds, taking indexes after `len` will panic.
///
/// # Examples
/// ```
/// # use std::sync::Arc;
/// # use arrow_array::{StringArray, UInt32Array, cast::AsArray};
/// # use arrow_select::take::{take, take_arrays};
/// let string_values = Arc::new(StringArray::from(vec!["zero", "one", "two"]));
/// let values = Arc::new(UInt32Array::from(vec![0, 1, 2]));
///
/// // Take items at index 2, and 1:
/// let indices = UInt32Array::from(vec![2, 1]);
/// let taken_arrays = take_arrays(&[string_values, values], &indices, None).unwrap();
/// let taken_string = taken_arrays[0].as_string::<i32>();
/// assert_eq!(*taken_string, StringArray::from(vec!["two", "one"]));
/// let taken_values = taken_arrays[1].as_primitive();
/// assert_eq!(*taken_values, UInt32Array::from(vec![2, 1]));
/// ```
pub fn take_arrays(
    arrays: &[ArrayRef],
    indices: &dyn Array,
    options: Option<TakeOptions>,
) -> Result<Vec<ArrayRef>, ArrowError> {
    arrays
        .iter()
        .map(|array| take(array.as_ref(), indices, options.clone()))
        .collect()
}

/// Verifies that the non-null values of `indices` are all `< len`
fn check_bounds<T: ArrowPrimitiveType>(
    len: usize,
    indices: &PrimitiveArray<T>,
) -> Result<(), ArrowError>
where
    T::Native: Display,
{
    let Some(len) = T::Native::from_usize(len) else {
        return if T::DATA_TYPE.is_integer() {
            // the biggest representable value for T::Native is lower than len, e.g: u8::MAX < 512, no need to check bounds
            Ok(())
        } else {
            Err(ArrowError::ComputeError("Cast to usize failed".to_string()))
        };
    };

    if indices.null_count() > 0 {
        indices.iter().flatten().try_for_each(|index| {
            if index >= len {
                return Err(ArrowError::ComputeError(format!(
                    "Array index out of bounds, cannot get item at index {index} from {len} entries"
                )));
            }
            Ok(())
        })
    } else {
        let in_bounds = indices.values().iter().fold(true, |in_bounds, &i| {
            in_bounds & (i >= T::Native::ZERO) & (i < len)
        });

        if !in_bounds {
            for &index in indices.values() {
                if index < T::Native::ZERO || index >= len {
                    return Err(ArrowError::ComputeError(format!(
                        "Array index out of bounds, cannot get item at index {index} from {len} entries"
                    )));
                }
            }
        }

        Ok(())
    }
}

#[inline(never)]
fn take_impl<IndexType: ArrowPrimitiveType, const CHECKED: bool>(
    values: &dyn Array,
    indices: &PrimitiveArray<IndexType>,
) -> Result<ArrayRef, ArrowError> {
    if indices.is_empty() {
        if let DataType::Union(fields, _) = values.data_type()
            && fields.is_empty()
        {
            // `new_empty_array` cannot construct a union with no fields, but an existing empty
            // union can be sliced without materializing a child array.
            return Ok(values.slice(0, 0));
        }
        return Ok(new_empty_array(values.data_type()));
    }
    downcast_primitive_array! {
        values => Ok(Arc::new(take_primitive::<_, _, CHECKED>(values, indices)?)),
        DataType::Boolean => {
            let values = values.as_any().downcast_ref::<BooleanArray>().unwrap();
            Ok(Arc::new(take_boolean::<_, CHECKED>(values, indices)))
        }
        DataType::Utf8 => {
            Ok(Arc::new(take_bytes::<_, _, CHECKED>(values.as_string::<i32>(), indices)?))
        }
        DataType::LargeUtf8 => {
            Ok(Arc::new(take_bytes::<_, _, CHECKED>(values.as_string::<i64>(), indices)?))
        }
        DataType::Utf8View => {
            Ok(Arc::new(take_byte_view::<_, _, CHECKED>(values.as_string_view(), indices)?))
        }
        DataType::List(_) => {
            Ok(Arc::new(take_list::<_, Int32Type, CHECKED>(values.as_list(), indices)?))
        }
        DataType::LargeList(_) => {
            Ok(Arc::new(take_list::<_, Int64Type, CHECKED>(values.as_list(), indices)?))
        }
        DataType::ListView(_) => {
            Ok(Arc::new(take_list_view::<_, Int32Type, CHECKED>(values.as_list_view(), indices)?))
        }
        DataType::LargeListView(_) => {
            Ok(Arc::new(take_list_view::<_, Int64Type, CHECKED>(values.as_list_view(), indices)?))
        }
        DataType::FixedSizeList(_, length) => {
            let values = values
                .as_any()
                .downcast_ref::<FixedSizeListArray>()
                .unwrap();
            Ok(Arc::new(take_fixed_size_list::<_, CHECKED>(
                values,
                indices,
                *length as u32,
            )?))
        }
        DataType::Map(field, ordered) => {
            let list_arr = ListArray::from(values.as_map().clone());
            let list_data = take_list::<_, Int32Type, CHECKED>(&list_arr, indices)?;
            let (_, offsets, entries, nulls) = list_data.into_parts();
            let entries = entries.as_struct().clone();
            Ok(Arc::new(MapArray::try_new(
                field.clone(),
                offsets,
                entries,
                nulls,
                *ordered,
            )?))
        }
        DataType::Struct(fields) => {
            let array: &StructArray = values.as_struct();
            let arrays  = array
                .columns()
                .iter()
                .map(|a| take_impl::<_, CHECKED>(a.as_ref(), indices))
                .collect::<Result<Vec<ArrayRef>, _>>()?;
            let fields: Vec<(FieldRef, ArrayRef)> =
                fields.iter().cloned().zip(arrays).collect();

            // Create the null bit buffer.
            let is_valid: Buffer = indices
                .iter()
                .map(|index| {
                    if let Some(index) = index {
                        array.is_valid(index.to_usize().unwrap())
                    } else {
                        false
                    }
                })
                .collect();

            if fields.is_empty() {
                let nulls = NullBuffer::new(BooleanBuffer::new(is_valid, 0, indices.len()));
                Ok(Arc::new(StructArray::new_empty_fields(indices.len(), Some(nulls))))
            } else {
                Ok(Arc::new(StructArray::from((fields, is_valid))) as ArrayRef)
            }
        }
        DataType::Dictionary(_, _) => downcast_dictionary_array! {
            values => Ok(Arc::new(take_dict::<_, _, CHECKED>(values, indices)?)),
            t => unimplemented!("Take not supported for dictionary type {:?}", t)
        }
        DataType::RunEndEncoded(_, _) => downcast_run_array! {
            values => Ok(Arc::new(take_run(values, indices)?)),
            t => unimplemented!("Take not supported for run type {:?}", t)
        }
        DataType::Binary => {
            Ok(Arc::new(take_bytes::<_, _, CHECKED>(values.as_binary::<i32>(), indices)?))
        }
        DataType::LargeBinary => {
            Ok(Arc::new(take_bytes::<_, _, CHECKED>(values.as_binary::<i64>(), indices)?))
        }
        DataType::BinaryView => {
            Ok(Arc::new(take_byte_view::<_, _, CHECKED>(values.as_binary_view(), indices)?))
        }
        DataType::FixedSizeBinary(size) => {
            let values = values
                .as_any()
                .downcast_ref::<FixedSizeBinaryArray>()
                .unwrap();
            Ok(Arc::new(take_fixed_size_binary::<_, CHECKED>(values, indices, *size)?))
        }
        DataType::Null => {
            // Take applied to a null array produces a null array.
            if values.len() >= indices.len() {
                // If the existing null array is as big as the indices, we can use a slice of it
                // to avoid allocating a new null array.
                Ok(values.slice(0, indices.len()))
            } else {
                // If the existing null array isn't big enough, create a new one.
                Ok(new_null_array(&DataType::Null, indices.len()))
            }
        }
        DataType::Union(fields, UnionMode::Sparse) => {
            let mut children = Vec::with_capacity(fields.len());
            let values = values.as_any().downcast_ref::<UnionArray>().unwrap();
            let type_ids = take_union_type_ids(fields, values.type_ids(), indices)?;
            for (type_id, _field) in fields.iter() {
                let values = values.child(type_id);
                let values = take_impl::<_, CHECKED>(values, indices)?;
                children.push(values);
            }
            let array = UnionArray::try_new(fields.clone(), type_ids, None, children)?;
            Ok(Arc::new(array))
        }
        DataType::Union(fields, UnionMode::Dense) => {
            let values = values.as_any().downcast_ref::<UnionArray>().unwrap();

            let type_ids = PrimitiveArray::<Int8Type>::try_new(
                take_union_type_ids(fields, values.type_ids(), indices)?,
                None,
            )?;
            // Keep index nulls so `take` of each child writes a null instead of
            // reading child offset 0 (the default `take_native` fills in).
            let offsets = <PrimitiveArray<Int32Type>>::try_new(
                take_native(values.offsets().unwrap(), indices),
                indices.nulls().cloned(),
            )?;

            let children = fields.iter()
                .map(|(field_type_id, _)| {
                    let mask = BooleanArray::from_unary(&type_ids, |value_type_id| value_type_id == field_type_id);

                    let indices = crate::filter::filter(&offsets, &mask)?;

                    let values = values.child(field_type_id);

                    take_impl::<_, CHECKED>(values, indices.as_primitive::<Int32Type>())
                })
                .collect::<Result<_, _>>()?;

            let mut child_offsets = [0; 128];

            let offsets = type_ids.values()
                .iter()
                .map(|&i| {
                    let offset = child_offsets[i as usize];

                    child_offsets[i as usize] += 1;

                    offset
                })
                .collect();

            let (_, type_ids, _) = type_ids.into_parts();

            let array = UnionArray::try_new(fields.clone(), type_ids, Some(offsets), children)?;

            Ok(Arc::new(array))
        }
        t => unimplemented!("Take not supported for data type {:?}", t)
    }
}

/// Takes union type ids, substituting a valid type id for null take indices.
///
/// Union arrays do not have a top-level null bitmap. A null is represented by selecting an
/// arbitrary valid child type id with a null value in that child. In particular, a null index
/// cannot fall back to type id `0`, as unions are not required to have such a child.
fn take_union_type_ids<IndexType: ArrowPrimitiveType>(
    fields: &UnionFields,
    type_ids: &ScalarBuffer<i8>,
    indices: &PrimitiveArray<IndexType>,
) -> Result<ScalarBuffer<i8>, ArrowError> {
    if indices.null_count() == 0 {
        return Ok(take_native(type_ids, indices));
    }

    let null_type_id = fields
        .iter()
        .next()
        .map(|(type_id, _)| type_id)
        .ok_or_else(|| {
            ArrowError::ComputeError(
                "Cannot take from a union with zero fields when indices contains nulls".into(),
            )
        })?;
    let taken_type_ids = take_native(type_ids, indices);
    let type_ids = indices
        .iter()
        .zip(&taken_type_ids)
        .map(|(index, &type_id)| {
            if index.is_some() {
                type_id
            } else {
                null_type_id
            }
        })
        .collect::<ScalarBuffer<_>>();
    Ok(type_ids)
}

/// Options that define how `take` should behave
#[derive(Clone, Debug, Default)]
pub struct TakeOptions {
    /// Perform bounds check before taking indices from values.
    /// If enabled, an `ArrowError` is returned if the indices are out of bounds.
    /// If not enabled, and indices exceed bounds, the kernel will panic.
    pub check_bounds: bool,
}

/// `take` implementation for all primitive arrays
///
/// This checks if an `indices` slot is populated, and gets the value from `values`
///  as the populated index.
/// If the `indices` slot is null, a null value is returned.
/// For example, given:
///     values:  [1, 2, 3, null, 5]
///     indices: [0, null, 4, 3]
/// The result is: [1 (slot 0), null (null slot), 5 (slot 4), null (slot 3)]
fn take_primitive<T, I, const CHECKED: bool>(
    values: &PrimitiveArray<T>,
    indices: &PrimitiveArray<I>,
) -> Result<PrimitiveArray<T>, ArrowError>
where
    T: ArrowPrimitiveType,
    I: ArrowPrimitiveType,
{
    let values_buf = take_native(values.values(), indices);
    let nulls = take_nulls::<_, CHECKED>(values.nulls(), indices);
    Ok(PrimitiveArray::try_new(values_buf, nulls)?.with_data_type(values.data_type().clone()))
}

#[inline(never)]
fn take_nulls<I: ArrowPrimitiveType, const CHECKED: bool>(
    values: Option<&NullBuffer>,
    indices: &PrimitiveArray<I>,
) -> Option<NullBuffer> {
    match values.filter(|n| n.null_count() > 0) {
        Some(n) => NullBuffer::from_unsliced_buffer(
            take_bits::<_, CHECKED>(n.inner(), indices).into_inner(),
            indices.len(),
        ),
        None => indices.nulls().cloned(),
    }
}

#[inline(never)]
fn take_native<T: ArrowNativeType, I: ArrowPrimitiveType>(
    values: &[T],
    indices: &PrimitiveArray<I>,
) -> ScalarBuffer<T> {
    match indices.nulls().filter(|n| n.null_count() > 0) {
        Some(n) => indices
            .values()
            .iter()
            .enumerate()
            .map(|(idx, index)| match values.get(index.as_usize()) {
                Some(v) => *v,
                // SAFETY: idx<indices.len()
                None => match unsafe { n.inner().value_unchecked(idx) } {
                    false => T::default(),
                    true => panic!("Out-of-bounds index {index:?}"),
                },
            })
            .collect(),
        None => indices
            .values()
            .iter()
            .map(|index| values[index.as_usize()])
            .collect(),
    }
}

/// Read the bit at `src_bit_idx` from `src` and, if it is set, write a `1` to `dst_bit_idx`
/// in `dst`. Leaves `dst_bit_idx` unchanged (zero) when the source bit is unset.
///
/// ```text
/// src = 0b00100000  (bit 5 is set)
/// copy_bit_if_set(src, 5, dst, 2)  →  dst bit 2 becomes 1
/// ```
///
/// # Safety
/// - `src` must be valid for reads up to byte `src_bit_idx / 8`.
/// - `dst` must be valid for writes up to byte `dst_bit_idx / 8`.
#[inline(always)]
unsafe fn copy_bit_if_set(src: *const u8, src_bit_idx: usize, dst: *mut u8, dst_bit_idx: usize) {
    unsafe {
        if bit_util::get_bit_raw(src, src_bit_idx) {
            bit_util::set_bit_raw(dst, dst_bit_idx);
        }
    }
}

/// Read the bit at `bit_idx` from `src` and return it shifted to `out_pos`, ready to be
/// OR'd into an output byte accumulator.
///
/// ```text
/// src = 0b10100000  (bit 5 is set)
/// pack_bit(src, 5, 2)  →  0b00000100   (bit from position 5, placed at position 2)
/// ```
///
/// # Safety
/// `src` must be valid for reads up to byte `bit_idx / 8`.
#[inline(always)]
unsafe fn pack_bit(src: *const u8, bit_idx: usize, out_pos: usize) -> u8 {
    let byte = unsafe { *src.add(bit_idx >> 3) }; // byte containing bit `bit_idx`
    ((byte >> (bit_idx & 7)) & 1) << out_pos // extract the bit, shift to output position
}

#[inline(never)]
fn take_bits<I: ArrowPrimitiveType, const CHECKED: bool>(
    values: &BooleanBuffer,
    indices: &PrimitiveArray<I>,
) -> BooleanBuffer {
    let len = indices.len();
    let src_offset = values.offset();
    let src_ptr = values.values().as_ptr();
    let out_bytes = len.div_ceil(8);

    match indices.nulls().filter(|nulls| nulls.null_count() > 0) {
        Some(index_nulls) => {
            let mut output = vec![0u8; out_bytes];
            let out_ptr = output.as_mut_ptr();
            index_nulls.valid_indices().for_each(|valid_idx| {
                // SAFETY: valid_idx < indices.len(), guaranteed by valid_indices().
                let index_val = unsafe { indices.value_unchecked(valid_idx) }.as_usize();
                if CHECKED {
                    if values.value(index_val) {
                        // SAFETY: valid_idx < indices.len() = len, output buffer holds len bits.
                        unsafe { bit_util::set_bit_raw(out_ptr, valid_idx) };
                    }
                } else {
                    // SAFETY: caller guarantees index_val < values.len().
                    unsafe { copy_bit_if_set(src_ptr, index_val + src_offset, out_ptr, valid_idx) };
                }
            });
            BooleanBuffer::new(Buffer::from(output), 0, len)
        }
        None => {
            // Build the output byte-by-byte with an 8-element inner loop so the
            // compiler can fully unroll it and issue the 8 source loads in parallel.
            let mut output = vec![0u8; out_bytes];
            let out_slice = output.as_mut_slice();
            let full_bytes = len / 8;

            for (byte_idx, out_byte) in out_slice.iter_mut().enumerate().take(full_bytes) {
                let base = byte_idx * 8;
                let mut byte = 0u8;
                for bit in 0..8usize {
                    // SAFETY: base + bit < full_bytes * 8 <= len, so base + bit is a valid
                    // position in the indices array.
                    let index_val = unsafe { indices.value_unchecked(base + bit) }.as_usize();
                    if CHECKED {
                        byte |= (values.value(index_val) as u8) << bit;
                    } else {
                        // SAFETY: caller guarantees index_val < values.len().
                        byte |= unsafe { pack_bit(src_ptr, index_val + src_offset, bit) };
                    }
                }
                *out_byte = byte;
            }
            // Handle remaining bits when len is not a multiple of 8.
            if full_bytes < out_bytes {
                let base = full_bytes * 8;
                let mut byte = 0u8;
                for bit in 0..(len - base) {
                    // SAFETY: base + bit < len (remainder loop bound), so base + bit is a
                    // valid position in the indices array.
                    let index_val = unsafe { indices.value_unchecked(base + bit) }.as_usize();
                    if CHECKED {
                        byte |= (values.value(index_val) as u8) << bit;
                    } else {
                        // SAFETY: caller guarantees index_val < values.len().
                        byte |= unsafe { pack_bit(src_ptr, index_val + src_offset, bit) };
                    }
                }
                out_slice[full_bytes] = byte;
            }
            BooleanBuffer::new(Buffer::from(output), 0, len)
        }
    }
}

/// Gather value bits and validity bits from two boolean buffers in a single pass.
/// Used when the values array itself has nulls, avoiding two separate `take_bits` calls.
#[inline(never)]
fn take_bits_with_validity<I: ArrowPrimitiveType, const CHECKED: bool>(
    values: &BooleanBuffer,
    validity: &BooleanBuffer,
    indices: &PrimitiveArray<I>,
) -> (BooleanBuffer, Option<NullBuffer>) {
    let len = indices.len();
    let value_bit_offset = values.offset();
    let validity_bit_offset = validity.offset();
    let value_data_ptr = values.values().as_ptr();
    let validity_data_ptr = validity.values().as_ptr();
    let out_bytes = len.div_ceil(8);

    let mut value_out = vec![0u8; out_bytes];
    let mut validity_out = vec![0u8; out_bytes];

    match indices.nulls().filter(|nulls| nulls.null_count() > 0) {
        Some(index_nulls) => {
            let value_out_ptr = value_out.as_mut_ptr();
            let validity_out_ptr = validity_out.as_mut_ptr();
            for out_pos in index_nulls.valid_indices() {
                // SAFETY: out_pos < indices.len(), guaranteed by valid_indices().
                let src_idx = unsafe { indices.value_unchecked(out_pos) }.as_usize();
                if CHECKED {
                    if values.value(src_idx) {
                        // SAFETY: out_pos < indices.len() = len, output buffer holds len bits.
                        unsafe { bit_util::set_bit_raw(value_out_ptr, out_pos) };
                    }
                    if validity.value(src_idx) {
                        // SAFETY: out_pos < indices.len() = len, output buffer holds len bits.
                        unsafe { bit_util::set_bit_raw(validity_out_ptr, out_pos) };
                    }
                } else {
                    // SAFETY: caller guarantees src_idx < values.len().
                    unsafe {
                        copy_bit_if_set(
                            value_data_ptr,
                            src_idx + value_bit_offset,
                            value_out_ptr,
                            out_pos,
                        );
                        copy_bit_if_set(
                            validity_data_ptr,
                            src_idx + validity_bit_offset,
                            validity_out_ptr,
                            out_pos,
                        );
                    }
                }
            }
        }
        None => {
            let value_out_slice = value_out.as_mut_slice();
            let validity_out_slice = validity_out.as_mut_slice();
            let full_bytes = len / 8;

            for (byte_idx, (value_out_byte, validity_out_byte)) in value_out_slice
                .iter_mut()
                .zip(validity_out_slice.iter_mut())
                .enumerate()
                .take(full_bytes)
            {
                let bit_base = byte_idx * 8;
                let mut packed_values = 0u8;
                let mut packed_validity = 0u8;
                for bit_pos in 0..8usize {
                    // SAFETY: bit_base + bit_pos < full_bytes * 8 <= len.
                    let src_idx = unsafe { indices.value_unchecked(bit_base + bit_pos) }.as_usize();
                    if CHECKED {
                        packed_values |= (values.value(src_idx) as u8) << bit_pos;
                        packed_validity |= (validity.value(src_idx) as u8) << bit_pos;
                    } else {
                        // SAFETY: caller guarantees src_idx < values.len().
                        packed_values |= unsafe {
                            pack_bit(value_data_ptr, src_idx + value_bit_offset, bit_pos)
                        };
                        packed_validity |= unsafe {
                            pack_bit(validity_data_ptr, src_idx + validity_bit_offset, bit_pos)
                        };
                    }
                }
                *value_out_byte = packed_values;
                *validity_out_byte = packed_validity;
            }
            // Handle remaining bits when len is not a multiple of 8.
            if full_bytes < out_bytes {
                let bit_base = full_bytes * 8;
                let mut packed_values = 0u8;
                let mut packed_validity = 0u8;
                for bit_pos in 0..(len - bit_base) {
                    // SAFETY: bit_base + bit_pos < len (remainder loop bound).
                    let src_idx = unsafe { indices.value_unchecked(bit_base + bit_pos) }.as_usize();
                    if CHECKED {
                        packed_values |= (values.value(src_idx) as u8) << bit_pos;
                        packed_validity |= (validity.value(src_idx) as u8) << bit_pos;
                    } else {
                        // SAFETY: caller guarantees src_idx < values.len().
                        packed_values |= unsafe {
                            pack_bit(value_data_ptr, src_idx + value_bit_offset, bit_pos)
                        };
                        packed_validity |= unsafe {
                            pack_bit(validity_data_ptr, src_idx + validity_bit_offset, bit_pos)
                        };
                    }
                }
                value_out_slice[full_bytes] = packed_values;
                validity_out_slice[full_bytes] = packed_validity;
            }
        }
    }

    let value_buf_out = BooleanBuffer::new(Buffer::from(value_out), 0, len);
    let validity_buf_out = NullBuffer::from_unsliced_buffer(validity_out, len);
    (value_buf_out, validity_buf_out)
}

/// `take` implementation for boolean arrays
fn take_boolean<IndexType: ArrowPrimitiveType, const CHECKED: bool>(
    array: &BooleanArray,
    indices: &PrimitiveArray<IndexType>,
) -> BooleanArray {
    let bits = array.values();
    match array.nulls().filter(|n| n.null_count() > 0) {
        Some(array_nulls) => {
            let (val_buf, null_buf) =
                take_bits_with_validity::<_, CHECKED>(bits, array_nulls.inner(), indices);
            BooleanArray::new(val_buf, null_buf)
        }
        None => {
            let val_buf = take_bits::<_, CHECKED>(bits, indices);
            let null_buf = take_nulls::<_, CHECKED>(None, indices);
            BooleanArray::new(val_buf, null_buf)
        }
    }
}

/// `take` implementation for string arrays
fn take_bytes<T: ByteArrayType, IndexType: ArrowPrimitiveType, const CHECKED: bool>(
    array: &GenericByteArray<T>,
    indices: &PrimitiveArray<IndexType>,
) -> Result<GenericByteArray<T>, ArrowError> {
    let mut values: Vec<u8> = Vec::new();
    let mut offsets = Vec::with_capacity(indices.len() + 1);
    offsets.push(T::Offset::default());

    let input_offsets = array.value_offsets();
    let mut capacity = 0;
    let nulls = take_nulls::<_, CHECKED>(array.nulls(), indices);

    // Branch on output nulls — `None` means every output slot is valid.
    match nulls.as_ref().filter(|n| n.null_count() > 0) {
        // Fast path: no nulls in output, every index is valid.
        None => {
            for index in indices.values() {
                let index = index.as_usize();
                let start = input_offsets[index].as_usize();
                let end = input_offsets[index + 1].as_usize();
                capacity += end - start;
                offsets.push(
                    T::Offset::from_usize(capacity)
                        .ok_or_else(|| ArrowError::OffsetOverflowError(capacity))?,
                );
            }

            values.reserve(capacity);

            let dst = values.spare_capacity_mut();
            debug_assert!(dst.len() >= capacity);
            let mut offset = 0;

            for index in indices.values() {
                // SAFETY: in-bounds proven by the first loop's bounds-checked offset access.
                // dst asserted above to include the required capacity.
                unsafe {
                    let data: &[u8] = array.value_unchecked(index.as_usize()).as_ref();
                    std::ptr::copy_nonoverlapping(
                        data.as_ptr(),
                        dst.get_unchecked_mut(offset..).as_mut_ptr().cast::<u8>(),
                        data.len(),
                    );
                    offset += data.len();
                }
            }

            // SAFETY: wrote exactly `capacity` bytes above; reserved on line above.
            unsafe {
                values.set_len(capacity);
            }
        }
        // Nullable path: only process valid (non-null) output positions.
        Some(output_nulls) => {
            let mut source_ranges = Vec::with_capacity(indices.len() - output_nulls.null_count());
            let mut last_filled = 0;

            // Pre-fill offsets; we overwrite valid positions below.
            offsets.resize(indices.len() + 1, T::Offset::default());

            // Pass 1: find all valid ranges that need to be copied.
            for i in output_nulls.valid_indices() {
                let current_offset = T::Offset::from_usize(capacity)
                    .ok_or_else(|| ArrowError::OffsetOverflowError(capacity))?;
                // Fill offsets for skipped null slots so they get zero-length ranges.
                if last_filled < i {
                    offsets[last_filled + 1..=i].fill(current_offset);
                }

                // SAFETY: `i` comes from a validity bitmap over `indices`, so it is in-bounds.
                let index = unsafe { indices.value_unchecked(i) }.as_usize();
                let start = input_offsets[index].as_usize();
                let end = input_offsets[index + 1].as_usize();
                capacity += end - start;
                offsets[i + 1] = T::Offset::from_usize(capacity)
                    .ok_or_else(|| ArrowError::OffsetOverflowError(capacity))?;

                source_ranges.push((start, end));
                last_filled = i + 1;
            }

            // Fill trailing null offsets after the last valid position.
            let final_offset = T::Offset::from_usize(capacity)
                .ok_or_else(|| ArrowError::OffsetOverflowError(capacity))?;
            offsets[last_filled + 1..].fill(final_offset);
            // Pass 2: copy byte data for all collected ranges.
            values.reserve(capacity);
            debug_assert_eq!(
                source_ranges.iter().map(|(s, e)| e - s).sum::<usize>(),
                capacity,
                "capacity must equal total bytes across all ranges"
            );

            let src = array.value_data();
            let src = src.as_ptr();
            let dst = values.spare_capacity_mut();
            debug_assert!(dst.len() >= capacity);

            let mut offset = 0;

            for (start, end) in source_ranges {
                let value_len = end - start;
                // SAFETY: caller guarantees each (start, end) is in-bounds of `src`.
                // `dst` asserted above to include the required capacity.
                // The regions don't overlap (src is input, dst is a fresh allocation).
                unsafe {
                    std::ptr::copy_nonoverlapping(
                        src.add(start),
                        dst.get_unchecked_mut(offset..).as_mut_ptr().cast::<u8>(),
                        value_len,
                    );
                    offset += value_len;
                }
            }
            // SAFETY: caller guarantees `capacity` == total bytes across all ranges,
            // so the loop above wrote exactly `capacity` bytes.
            unsafe { values.set_len(capacity) };
        }
    }

    // SAFETY: offsets are monotonically increasing and in-bounds of `values`,
    // and `nulls` (if present) has length == `indices.len()`.
    let array = unsafe {
        let offsets = OffsetBuffer::new_unchecked(offsets.into());
        GenericByteArray::<T>::new_unchecked(offsets, values.into(), nulls)
    };

    Ok(array)
}

/// `take` implementation for byte view arrays
fn take_byte_view<T: ByteViewType, IndexType: ArrowPrimitiveType, const CHECKED: bool>(
    array: &GenericByteViewArray<T>,
    indices: &PrimitiveArray<IndexType>,
) -> Result<GenericByteViewArray<T>, ArrowError> {
    let new_views = take_native(array.views(), indices);
    let new_nulls = take_nulls::<_, CHECKED>(array.nulls(), indices);
    let buffers = Arc::clone(array.data_buffers());
    // Safety:  array.views was valid, and take_native copies only valid values, and verifies bounds
    Ok(unsafe { GenericByteViewArray::new_unchecked(new_views, buffers, new_nulls) })
}

/// `take` implementation for list arrays
///
/// Copies the selected list entries' child slices into a new child array
/// via `MutableArrayData`, then reconstructs a list array with new offsets
fn take_list<IndexType, OffsetType, const CHECKED: bool>(
    values: &GenericListArray<OffsetType::Native>,
    indices: &PrimitiveArray<IndexType>,
) -> Result<GenericListArray<OffsetType::Native>, ArrowError>
where
    IndexType: ArrowPrimitiveType,
    OffsetType: ArrowPrimitiveType,
    OffsetType::Native: OffsetSizeTrait,
    PrimitiveArray<OffsetType>: From<Vec<OffsetType::Native>>,
{
    let src_offsets = values.value_offsets();
    let child_data = values.values().to_data();
    let nulls = take_nulls::<_, CHECKED>(values.nulls(), indices);

    let mut dst_offsets = Vec::with_capacity(indices.len() + 1);
    dst_offsets.push(OffsetType::Native::zero());

    let field = values.value_field().clone();

    if child_data.null_count() == 0
        && let Some(bytes_per_value) = child_data.data_type().primitive_width()
    {
        let values_buf = &child_data.buffers()[0];
        let child_buf_offset = child_data.offset() * bytes_per_value;

        let avg_row_len = child_data
            .len()
            .checked_div(values.len().max(1))
            .unwrap_or(0);
        let mut dst_buf = MutableBuffer::new(
            avg_row_len
                .saturating_mul(indices.len())
                .saturating_mul(bytes_per_value),
        );

        let mut child_len = OffsetType::Native::zero();

        match nulls.as_ref().filter(|n| n.null_count() > 0) {
            None => {
                for &idx in indices.values() {
                    let row = idx.as_usize();
                    let start = child_buf_offset + src_offsets[row].as_usize() * bytes_per_value;
                    let end = child_buf_offset + src_offsets[row + 1].as_usize() * bytes_per_value;
                    dst_buf.extend_from_slice(&values_buf[start..end]);
                    child_len = child_len
                        .checked_add(&(src_offsets[row + 1] - src_offsets[row]))
                        .ok_or_else(|| ArrowError::OffsetOverflowError(child_len.as_usize()))?;
                    dst_offsets.push(child_len);
                }
            }
            Some(valid) => {
                let mut prev = 0;
                for vidx in valid.valid_indices() {
                    // Fill offsets for null values between the two valid indices.
                    if prev < vidx {
                        dst_offsets.extend(std::iter::repeat_n(child_len, vidx - prev));
                    }
                    let row = if CHECKED {
                        indices.value(vidx).as_usize()
                    } else {
                        // SAFETY: !CHECKED means the caller guarantees all indices are valid;
                        // `vidx` is further bounded by the validity bitmap of `indices`.
                        unsafe { indices.value_unchecked(vidx) }.as_usize()
                    };
                    let start = child_buf_offset + src_offsets[row].as_usize() * bytes_per_value;
                    let end = child_buf_offset + src_offsets[row + 1].as_usize() * bytes_per_value;
                    dst_buf.extend_from_slice(&values_buf[start..end]);
                    child_len = child_len
                        .checked_add(&(src_offsets[row + 1] - src_offsets[row]))
                        .ok_or_else(|| ArrowError::OffsetOverflowError(child_len.as_usize()))?;
                    dst_offsets.push(child_len);
                    prev = vidx + 1;
                }
                dst_offsets.extend(std::iter::repeat_n(child_len, indices.len() - prev));
            }
        }

        debug_assert_eq!(
            dst_offsets.len(),
            indices.len() + 1,
            "New offsets was filled under/over the expected capacity"
        );

        // Safety: data_type, len, and buffer are all derived from the already-validated
        // source child_data, so re-validation is unnecessary.
        let child = make_array(unsafe {
            ArrayData::builder(child_data.data_type().clone())
                .len(child_len.as_usize())
                .add_buffer(dst_buf.into())
                .build_unchecked()
        });
        // SAFETY: `dst_offsets` is constructed to be monotonically increasing above.
        let offsets = unsafe { OffsetBuffer::new_unchecked(ScalarBuffer::from(dst_offsets)) };
        return GenericListArray::<OffsetType::Native>::try_new(field, offsets, child, nulls);
    }

    let capacity = child_data
        .len()
        .checked_div(values.len())
        .map(|avg| avg * indices.len())
        .unwrap_or_default();
    let mut mutable =
        MutableArrayData::new(vec![&child_data], child_data.null_count() > 0, capacity);

    match nulls.as_ref().filter(|n| n.null_count() > 0) {
        None => {
            for idx in indices.values() {
                let row = idx.as_usize();
                mutable.try_extend(
                    0,
                    src_offsets[row].as_usize(),
                    src_offsets[row + 1].as_usize(),
                )?;
                dst_offsets.push(
                    OffsetType::Native::from_usize(mutable.len())
                        .ok_or_else(|| ArrowError::OffsetOverflowError(mutable.len()))?,
                );
            }
        }
        Some(valid) => {
            let mut last = 0;
            for i in valid.valid_indices() {
                let current = OffsetType::Native::from_usize(mutable.len())
                    .ok_or_else(|| ArrowError::OffsetOverflowError(mutable.len()))?;
                if last < i {
                    dst_offsets.extend(std::iter::repeat_n(current, i - last));
                }
                let row = if CHECKED {
                    indices.value(i).as_usize()
                } else {
                    // SAFETY: !CHECKED means the caller guarantees all indices are valid;
                    // `i` is further bounded by the validity bitmap of `indices`.
                    unsafe { indices.value_unchecked(i) }.as_usize()
                };
                mutable.try_extend(
                    0,
                    src_offsets[row].as_usize(),
                    src_offsets[row + 1].as_usize(),
                )?;
                dst_offsets.push(
                    OffsetType::Native::from_usize(mutable.len())
                        .ok_or_else(|| ArrowError::OffsetOverflowError(mutable.len()))?,
                );
                last = i + 1;
            }
            // Filling offsets for null values at the end
            let final_offset = OffsetType::Native::from_usize(mutable.len())
                .ok_or_else(|| ArrowError::OffsetOverflowError(mutable.len()))?;
            dst_offsets.extend(std::iter::repeat_n(final_offset, indices.len() - last));
        }
    }

    debug_assert_eq!(dst_offsets.len(), indices.len() + 1);

    // SAFETY: `dst_offsets` is constructed to be monotonically increasing above
    let offsets = unsafe { OffsetBuffer::new_unchecked(ScalarBuffer::from(dst_offsets)) };
    let child = make_array(mutable.freeze());
    GenericListArray::<OffsetType::Native>::try_new(field, offsets, child, nulls)
}

fn take_list_view<IndexType, OffsetType, const CHECKED: bool>(
    values: &GenericListViewArray<OffsetType::Native>,
    indices: &PrimitiveArray<IndexType>,
) -> Result<GenericListViewArray<OffsetType::Native>, ArrowError>
where
    IndexType: ArrowPrimitiveType,
    OffsetType: ArrowPrimitiveType,
    OffsetType::Native: OffsetSizeTrait,
{
    let taken_offsets = take_native(values.offsets(), indices);
    let taken_sizes = take_native(values.sizes(), indices);
    let nulls = take_nulls::<_, CHECKED>(values.nulls(), indices);

    let field = match values.data_type() {
        DataType::ListView(field) | DataType::LargeListView(field) => field.clone(),
        d => unreachable!("take_list_view called with non-list-view data type {d}"),
    };

    // SAFETY: the taken offsets/sizes are a permutation of the (valid) input
    // offsets/sizes, so they remain within the bounds of the child array.
    Ok(unsafe {
        GenericListViewArray::<OffsetType::Native>::new_unchecked(
            field,
            taken_offsets,
            taken_sizes,
            Arc::clone(values.values()),
            nulls,
        )
    })
}

/// `take` implementation for `FixedSizeListArray`
///
/// Calculates the index and indexed offset for the inner array,
/// applying `take` on the inner array, then reconstructing a list array
/// with the indexed offsets
fn take_fixed_size_list<IndexType: ArrowPrimitiveType, const CHECKED: bool>(
    values: &FixedSizeListArray,
    indices: &PrimitiveArray<IndexType>,
    length: <UInt32Type as ArrowPrimitiveType>::Native,
) -> Result<FixedSizeListArray, ArrowError> {
    let field = values.value_field();
    let child = values.values();
    let nulls = take_nulls::<_, CHECKED>(values.nulls(), indices);

    // Fast path: primitive child with no nulls  copy row-sized byte blocks directly,
    let taken_child = if child.null_count() == 0
        && let Some(element_size) = child.data_type().primitive_width()
    {
        take_fixed_size_list_primitive(
            child,
            indices,
            length as usize,
            element_size,
            nulls.as_ref(),
        )
    } else {
        let list_indices = take_value_indices_from_fixed_size_list(values, indices, length)?;
        take_impl::<UInt32Type, CHECKED>(child.as_ref(), &list_indices)?
    };

    FixedSizeListArray::try_new_with_length(
        field.clone(),
        length as i32,
        taken_child,
        nulls,
        indices.len(),
    )
}

#[inline(never)]
fn take_fixed_size_list_primitive<IndexType: ArrowPrimitiveType>(
    child: &ArrayRef,
    indices: &PrimitiveArray<IndexType>,
    list_size: usize,
    element_size: usize,
    taken_row_nulls: Option<&NullBuffer>,
) -> ArrayRef {
    let row_bytes = list_size * element_size;
    let child_data = child.to_data();
    let src = child_data.buffers()[0].as_slice();
    let child_byte_offset = child_data.offset() * element_size;

    debug_assert!(
        indices.len().checked_mul(row_bytes).is_some(),
        "take_fixed_size_list_primitive: output buffer size overflows usize"
    );
    let out_len = indices.len() * list_size;

    let mut out = MutableBuffer::from_len_zeroed(indices.len() * row_bytes);
    let out_slice = out.as_slice_mut();

    if indices.null_count() == 0 {
        for (out_row, index) in indices.values().iter().enumerate() {
            let src_start = child_byte_offset + index.as_usize() * row_bytes;
            out_slice[out_row * row_bytes..(out_row + 1) * row_bytes]
                .copy_from_slice(&src[src_start..src_start + row_bytes]);
        }
    } else {
        for (out_row, index) in indices.values().iter().enumerate() {
            if indices.is_valid(out_row) {
                let src_start = child_byte_offset + index.as_usize() * row_bytes;
                out_slice[out_row * row_bytes..(out_row + 1) * row_bytes]
                    .copy_from_slice(&src[src_start..src_start + row_bytes]);
            }
        }
    }
    // Expand the per-row null bitmap to per-element: each null row produces `list_size` null elements.
    let child_null_buf = taken_row_nulls.map(|n| n.expand(list_size).buffer().clone());

    // SAFETY:
    // - The data buffer has `indices.len() * row_bytes` bytes = `out_len` elements of a
    //   primitive type, matching `.len(out_len)`.
    // - The null buffer (when present) is `ceil(out_len, 8)` bytes via `expand(list_size).buffer()`.
    // - Primitive types have exactly one value buffer.
    let array_data = unsafe {
        ArrayData::builder(child.data_type().clone())
            .len(out_len)
            .add_buffer(out.into())
            .null_bit_buffer(child_null_buf)
            .build_unchecked()
    };
    make_array(array_data)
}

/// The take kernel implementation for `FixedSizeBinaryArray`.
///
/// The computation is done in two steps:
/// - Compute the values buffer
/// - Compute the null buffer
fn take_fixed_size_binary<IndexType: ArrowPrimitiveType, const CHECKED: bool>(
    values: &FixedSizeBinaryArray,
    indices: &PrimitiveArray<IndexType>,
    size: i32,
) -> Result<FixedSizeBinaryArray, ArrowError> {
    let size_usize = usize::try_from(size).map_err(|_| {
        ArrowError::InvalidArgumentError(format!("Cannot convert size '{size}' to usize"))
    })?;

    let result_buffer = match size_usize {
        1 => take_fixed_size::<IndexType, 1>(values.values(), indices),
        2 => take_fixed_size::<IndexType, 2>(values.values(), indices),
        4 => take_fixed_size::<IndexType, 4>(values.values(), indices),
        8 => take_fixed_size::<IndexType, 8>(values.values(), indices),
        16 => take_fixed_size::<IndexType, 16>(values.values(), indices),
        _ => take_fixed_size_binary_buffer_dynamic_length(values, indices, size_usize),
    };

    let value_nulls = take_nulls::<_, CHECKED>(values.nulls(), indices);
    let final_nulls = NullBuffer::union(value_nulls.as_ref(), indices.nulls());

    return FixedSizeBinaryArray::try_new(size, result_buffer, final_nulls);

    /// Implementation of the take kernel for fixed size binary arrays.
    #[inline(never)]
    fn take_fixed_size_binary_buffer_dynamic_length<IndexType: ArrowPrimitiveType>(
        values: &FixedSizeBinaryArray,
        indices: &PrimitiveArray<IndexType>,
        size_usize: usize,
    ) -> Buffer {
        let values_buffer = values.values().as_slice();
        let mut output = Vec::with_capacity(indices.len() * size_usize);

        if indices.null_count() == 0 {
            let array_iter = indices.values().iter().map(|idx| {
                let offset = idx.as_usize() * size_usize;
                &values_buffer[offset..offset + size_usize]
            });
            for slice in array_iter {
                output.extend_from_slice(slice);
            }
        } else {
            // The indices nullability cannot be ignored here because the values buffer may contain
            // nulls which should not cause a panic.
            let array_iter = indices.iter().map(|idx| {
                idx.map(|idx| {
                    let offset = idx.as_usize() * size_usize;
                    &values_buffer[offset..offset + size_usize]
                })
            });
            for slice in array_iter {
                match slice {
                    None => output.resize(output.len() + size_usize, 0),
                    Some(slice) => output.extend_from_slice(slice),
                }
            }
        }

        output.into()
    }
}

/// Implements the take kernel semantics over a flat [`Buffer`], interpreting it as a slice of
/// `&[[u8; N]]`, where `N` is a compile-time constant. The usage of a flat [`Buffer`] allows using
/// this kernel without an available [`ArrowPrimitiveType`] (e.g., for `[u8; 5]`).
///
/// # Using This Function in the Primitive Take Kernel
///
/// This function is basically the same as [`take_native`] but just on a flat [`Buffer`] instead of
/// the primitive [`ScalarBuffer`]. Ideally, the [`take_primitive`] kernel should just use this
/// more general function. However, the "idiomatic code" requires the
/// [feature(generic_const_exprs)](https://github.com/rust-lang/rust/issues/76560) for calling
/// `take_fixed_size<I, { size_of::<T::Native> () } >(...)`. Once this feature has been stabilized,
/// we can use this function also in the primitive kernels.
fn take_fixed_size<IndexType: ArrowPrimitiveType, const N: usize>(
    buffer: &Buffer,
    indices: &PrimitiveArray<IndexType>,
) -> Buffer {
    assert_eq!(
        buffer.len() % N,
        0,
        "Invalid array length in take_fixed_size"
    );

    let ptr = buffer.as_ptr();
    let chunk_ptr = ptr.cast::<[u8; N]>();
    let chunk_len = buffer.len() / N;
    let buffer: &[[u8; N]] = unsafe {
        // SAFETY: interpret an already valid slice as a slice of N-byte chunks. N divides buffer
        // length without remainder.
        std::slice::from_raw_parts(chunk_ptr, chunk_len)
    };

    let result_buffer = match indices.nulls().filter(|n| n.null_count() > 0) {
        Some(n) => indices
            .values()
            .iter()
            .enumerate()
            .map(|(idx, index)| match buffer.get(index.as_usize()) {
                Some(v) => *v,
                // SAFETY: idx<indices.len()
                None => match unsafe { n.inner().value_unchecked(idx) } {
                    false => [0u8; N],
                    true => panic!("Out-of-bounds index {index:?}"),
                },
            })
            .collect::<Vec<_>>(),
        None => indices
            .values()
            .iter()
            .map(|index| buffer[index.as_usize()])
            .collect::<Vec<_>>(),
    };

    let mut vec = ManuallyDrop::new(result_buffer); // Prevent de-allocation
    let ptr = vec.as_mut_ptr();
    let len = vec.len();
    let cap = vec.capacity();
    let result_buffer = unsafe {
        // SAFETY: flattening an already valid Vec.
        Vec::from_raw_parts(ptr.cast::<u8>(), len * N, cap * N)
    };

    Buffer::from_vec(result_buffer)
}

/// `take` implementation for dictionary arrays
///
/// applies `take` to the keys of the dictionary array and returns a new dictionary array
/// with the same dictionary values and reordered keys
fn take_dict<T: ArrowDictionaryKeyType, I: ArrowPrimitiveType, const CHECKED: bool>(
    values: &DictionaryArray<T>,
    indices: &PrimitiveArray<I>,
) -> Result<DictionaryArray<T>, ArrowError> {
    let new_keys = take_primitive::<_, _, CHECKED>(values.keys(), indices)?;
    Ok(unsafe { DictionaryArray::new_unchecked(new_keys, values.values().clone()) })
}

/// `take` implementation for run arrays
///
/// Finds physical indices for the given logical indices and builds output run array
/// by taking values in the input run_array.values at the physical indices.
/// The output run array will be run encoded on the physical indices and not on output values.
/// For e.g. an input `RunArray{ run_ends = [2,4,6,8], values=[1,2,1,2] }` and `logical_indices=[2,3,6,7]`
/// would be converted to `physical_indices=[1,1,3,3]` which will be used to build
/// output `RunArray{ run_ends=[2,4], values=[2,2] }`.
///
/// A null logical index becomes a null run. Consecutive nulls are merged.
fn take_run<T: RunEndIndexType, I: ArrowPrimitiveType>(
    run_array: &RunArray<T>,
    logical_indices: &PrimitiveArray<I>,
) -> Result<RunArray<T>, ArrowError> {
    let physical_indices = physical_indices_for_take(run_array, logical_indices)?;

    // Run encode the physical indices into new_run_ends
    // Keep track of the physical indices to take in take_value_indices
    // `unwrap` is used in this function because the unwrapped values are bounded by the corresponding `::Native`.
    let mut new_run_ends = Vec::with_capacity(1);
    let mut take_value_indices = Vec::with_capacity(1);
    let mut take_value_is_valid = NullBufferBuilder::new(1);

    let values_cmp = make_comparator(
        run_array.values().as_ref(),
        run_array.values().as_ref(),
        SortOptions::default(),
    )?;

    for ix in 1..physical_indices.len() {
        let prev_idx = physical_indices[ix - 1];
        let cur_idx = physical_indices[ix];
        if is_new_run_take(run_array.values().as_ref(), prev_idx, cur_idx, &values_cmp) {
            // Safe unwrap since physical indices came from a valid run array.
            let index = I::Native::from_usize(prev_idx.unwrap_or_default()).unwrap();
            take_value_indices.push(index);
            take_value_is_valid
                .append(prev_idx.is_some_and(|idx| run_array.values().is_valid(idx)));
            new_run_ends.push(T::Native::from_usize(ix).unwrap());
        }
    }
    let last = physical_indices[physical_indices.len() - 1];
    // Safe unwrap since physical indices came from a valid run array.
    let index = I::Native::from_usize(last.unwrap_or_default()).unwrap();
    take_value_indices.push(index);
    take_value_is_valid.append(last.is_some_and(|idx| run_array.values().is_valid(idx)));
    new_run_ends.push(T::Native::from_usize(physical_indices.len()).unwrap());

    // SAFETY: run-ends are strictly increasing with last value == logical length.
    let run_ends = unsafe {
        RunEndBuffer::new_unchecked(ScalarBuffer::from(new_run_ends), 0, physical_indices.len())
    };

    let nulls = take_value_is_valid.finish();
    let take_value_indices =
        PrimitiveArray::<I>::new(ScalarBuffer::from(take_value_indices), nulls);

    let new_values = take(run_array.values(), &take_value_indices, None)?;

    // SAFETY: `new_values` has one entry per run.
    Ok(
        unsafe {
            RunArray::<T>::new_unchecked(run_array.data_type().clone(), run_ends, new_values)
        },
    )
}

/// Physical run index for each logical take slot.
///
/// `None` means the logical index is null. Only valid indices are passed to
/// [`RunArray::get_physical_indices`]; a null slot's backing integer is ignored
/// and may be out of range.
fn physical_indices_for_take<T: RunEndIndexType, I: ArrowPrimitiveType>(
    run_array: &RunArray<T>,
    logical_indices: &PrimitiveArray<I>,
) -> Result<Vec<Option<usize>>, ArrowError> {
    if logical_indices.null_count() == 0 {
        return Ok(run_array
            .get_physical_indices(logical_indices.values())?
            .into_iter()
            .map(Some)
            .collect());
    }

    let valid_logical: Vec<_> = logical_indices.iter().flatten().collect();

    let valid_physical = if valid_logical.is_empty() {
        Vec::new()
    } else {
        run_array.get_physical_indices(&valid_logical)?
    };

    let mut valid_physical = valid_physical.into_iter();
    Ok(logical_indices
        .iter()
        .map(|index| index.map(|_| valid_physical.next().unwrap()))
        .collect())
}

fn is_new_run_take(
    values: &dyn Array,
    prev_idx: Option<usize>,
    cur_idx: Option<usize>,
    values_cmp: &arrow_cmp::DynComparator,
) -> bool {
    let prev_valid = prev_idx.is_some_and(|idx| values.is_valid(idx));
    let cur_valid = cur_idx.is_some_and(|idx| values.is_valid(idx));
    match (prev_valid, cur_valid) {
        (false, false) => false,
        (true, true) => {
            let prev = prev_idx.unwrap();
            let cur = cur_idx.unwrap();
            prev != cur && values_cmp(cur, prev).is_ne()
        }
        _ => true,
    }
}

/// Takes/filters a fixed size list array's inner data using the offsets of the list array.
fn take_value_indices_from_fixed_size_list<IndexType>(
    list: &FixedSizeListArray,
    indices: &PrimitiveArray<IndexType>,
    length: <UInt32Type as ArrowPrimitiveType>::Native,
) -> Result<PrimitiveArray<UInt32Type>, ArrowError>
where
    IndexType: ArrowPrimitiveType,
{
    let mut values = UInt32Builder::with_capacity(length as usize * indices.len());

    for i in 0..indices.len() {
        if indices.is_valid(i) {
            let index = indices
                .value(i)
                .to_usize()
                .ok_or_else(|| ArrowError::ComputeError("Cast to usize failed".to_string()))?;
            let start = list.value_offset(index) as <UInt32Type as ArrowPrimitiveType>::Native;

            // Safety: Range always has known length.
            unsafe {
                values.append_trusted_len_iter(start..start + length);
            }
        } else {
            values.append_nulls(length as usize);
        }
    }

    Ok(values.finish())
}

/// To avoid generating take implementations for every index type, instead we
/// only generate for UInt32 and UInt64 and coerce inputs to these types
trait ToIndices {
    type T: ArrowPrimitiveType;

    fn to_indices(&self) -> PrimitiveArray<Self::T>;
}

macro_rules! to_indices_reinterpret {
    ($t:ty, $o:ty) => {
        impl ToIndices for PrimitiveArray<$t> {
            type T = $o;

            fn to_indices(&self) -> PrimitiveArray<$o> {
                let cast = ScalarBuffer::new(self.values().inner().clone(), 0, self.len());
                PrimitiveArray::new(cast, self.nulls().cloned())
            }
        }
    };
}

macro_rules! to_indices_identity {
    ($t:ty) => {
        impl ToIndices for PrimitiveArray<$t> {
            type T = $t;

            fn to_indices(&self) -> PrimitiveArray<$t> {
                self.clone()
            }
        }
    };
}

macro_rules! to_indices_widening {
    ($t:ty, $o:ty) => {
        impl ToIndices for PrimitiveArray<$t> {
            type T = UInt32Type;

            fn to_indices(&self) -> PrimitiveArray<$o> {
                let cast = self.values().iter().copied().map(|x| x as _).collect();
                PrimitiveArray::new(cast, self.nulls().cloned())
            }
        }
    };
}

to_indices_widening!(UInt8Type, UInt32Type);
to_indices_widening!(Int8Type, UInt32Type);

to_indices_widening!(UInt16Type, UInt32Type);
to_indices_widening!(Int16Type, UInt32Type);

to_indices_identity!(UInt32Type);
to_indices_reinterpret!(Int32Type, UInt32Type);

to_indices_identity!(UInt64Type);
to_indices_reinterpret!(Int64Type, UInt64Type);

/// Take rows by index from [`RecordBatch`] and returns a new [`RecordBatch`] from those indexes.
///
/// This function will call [`take`] on each array of the [`RecordBatch`] and assemble a new [`RecordBatch`].
///
/// # Example
/// ```
/// # use std::sync::Arc;
/// # use arrow_array::{StringArray, Int32Array, UInt32Array, RecordBatch};
/// # use arrow_schema::{DataType, Field, Schema};
/// # use arrow_select::take::take_record_batch;
/// let schema = Arc::new(Schema::new(vec![
///     Field::new("a", DataType::Int32, true),
///     Field::new("b", DataType::Utf8, true),
/// ]));
/// let batch = RecordBatch::try_new(
///     schema.clone(),
///     vec![
///         Arc::new(Int32Array::from_iter_values(0..20)),
///         Arc::new(StringArray::from_iter_values(
///             (0..20).map(|i| format!("str-{}", i)),
///         )),
///     ],
/// )
/// .unwrap();
///
/// let indices = UInt32Array::from(vec![1, 5, 10]);
/// let taken = take_record_batch(&batch, &indices).unwrap();
///
/// let expected = RecordBatch::try_new(
///     schema,
///     vec![
///         Arc::new(Int32Array::from(vec![1, 5, 10])),
///         Arc::new(StringArray::from(vec!["str-1", "str-5", "str-10"])),
///     ],
/// )
/// .unwrap();
/// assert_eq!(taken, expected);
/// ```
pub fn take_record_batch(
    record_batch: &RecordBatch,
    indices: &dyn Array,
) -> Result<RecordBatch, ArrowError> {
    let columns = record_batch
        .columns()
        .iter()
        .map(|c| take(c, indices, None))
        .collect::<Result<Vec<_>, _>>()?;
    RecordBatch::try_new(record_batch.schema(), columns)
}

#[cfg(test)]
mod tests {
    use super::*;
    use arrow_array::builder::*;
    use arrow_buffer::{IntervalDayTime, IntervalMonthDayNano};
    use arrow_data::ArrayData;
    use arrow_schema::{Field, Fields, TimeUnit, UnionFields};
    use num_traits::ToPrimitive;

    fn test_take_decimal_arrays(
        data: Vec<Option<i128>>,
        index: &UInt32Array,
        options: Option<TakeOptions>,
        expected_data: Vec<Option<i128>>,
        precision: &u8,
        scale: &i8,
    ) -> Result<(), ArrowError> {
        let output = data
            .into_iter()
            .collect::<Decimal128Array>()
            .with_precision_and_scale(*precision, *scale)
            .unwrap();

        let expected = expected_data
            .into_iter()
            .collect::<Decimal128Array>()
            .with_precision_and_scale(*precision, *scale)
            .unwrap();

        let expected = Arc::new(expected) as ArrayRef;
        let output = take(&output, index, options).unwrap();
        assert_eq!(&output, &expected);
        Ok(())
    }

    fn test_take_boolean_arrays(
        data: Vec<Option<bool>>,
        index: &UInt32Array,
        options: Option<TakeOptions>,
        expected_data: Vec<Option<bool>>,
    ) {
        let output = BooleanArray::from(data);
        let expected = Arc::new(BooleanArray::from(expected_data)) as ArrayRef;
        let output = take(&output, index, options).unwrap();
        assert_eq!(&output, &expected)
    }

    fn test_take_primitive_arrays<T>(
        data: Vec<Option<T::Native>>,
        index: &UInt32Array,
        options: Option<TakeOptions>,
        expected_data: Vec<Option<T::Native>>,
    ) -> Result<(), ArrowError>
    where
        T: ArrowPrimitiveType,
        PrimitiveArray<T>: From<Vec<Option<T::Native>>>,
    {
        let output = PrimitiveArray::<T>::from(data);
        let expected = Arc::new(PrimitiveArray::<T>::from(expected_data)) as ArrayRef;
        let output = take(&output, index, options)?;
        assert_eq!(&output, &expected);
        Ok(())
    }

    fn test_take_primitive_arrays_non_null<T>(
        data: Vec<T::Native>,
        index: &UInt32Array,
        options: Option<TakeOptions>,
        expected_data: Vec<Option<T::Native>>,
    ) -> Result<(), ArrowError>
    where
        T: ArrowPrimitiveType,
        PrimitiveArray<T>: From<Vec<T::Native>>,
        PrimitiveArray<T>: From<Vec<Option<T::Native>>>,
    {
        let output = PrimitiveArray::<T>::from(data);
        let expected = Arc::new(PrimitiveArray::<T>::from(expected_data)) as ArrayRef;
        let output = take(&output, index, options)?;
        assert_eq!(&output, &expected);
        Ok(())
    }

    fn test_take_impl_primitive_arrays<T, I>(
        data: Vec<Option<T::Native>>,
        index: &PrimitiveArray<I>,
        options: Option<TakeOptions>,
        expected_data: Vec<Option<T::Native>>,
    ) where
        T: ArrowPrimitiveType,
        PrimitiveArray<T>: From<Vec<Option<T::Native>>>,
        I: ArrowPrimitiveType,
    {
        let output = PrimitiveArray::<T>::from(data);
        let expected = PrimitiveArray::<T>::from(expected_data);
        let output = take(&output, index, options).unwrap();
        let output = output.as_any().downcast_ref::<PrimitiveArray<T>>().unwrap();
        assert_eq!(output, &expected)
    }

    // create a simple struct for testing purposes
    fn create_test_struct(values: Vec<Option<(Option<bool>, Option<i32>)>>) -> StructArray {
        let mut struct_builder = StructBuilder::new(
            Fields::from(vec![
                Field::new("a", DataType::Boolean, true),
                Field::new("b", DataType::Int32, true),
            ]),
            vec![
                Box::new(BooleanBuilder::with_capacity(values.len())),
                Box::new(Int32Builder::with_capacity(values.len())),
            ],
        );

        for value in values {
            struct_builder
                .field_builder::<BooleanBuilder>(0)
                .unwrap()
                .append_option(value.and_then(|v| v.0));
            struct_builder
                .field_builder::<Int32Builder>(1)
                .unwrap()
                .append_option(value.and_then(|v| v.1));
            struct_builder.append(value.is_some());
        }
        struct_builder.finish()
    }

    #[test]
    fn test_take_decimal128_non_null_indices() {
        let index = UInt32Array::from(vec![0, 5, 3, 1, 4, 2]);
        let precision: u8 = 10;
        let scale: i8 = 5;
        test_take_decimal_arrays(
            vec![None, Some(3), Some(5), Some(2), Some(3), None],
            &index,
            None,
            vec![None, None, Some(2), Some(3), Some(3), Some(5)],
            &precision,
            &scale,
        )
        .unwrap();
    }

    #[test]
    fn test_take_decimal128() {
        let index = UInt32Array::from(vec![Some(3), None, Some(1), Some(3), Some(2)]);
        let precision: u8 = 10;
        let scale: i8 = 5;
        test_take_decimal_arrays(
            vec![Some(0), Some(1), Some(2), Some(3), Some(4)],
            &index,
            None,
            vec![Some(3), None, Some(1), Some(3), Some(2)],
            &precision,
            &scale,
        )
        .unwrap();
    }

    #[test]
    fn test_take_primitive_non_null_indices() {
        let index = UInt32Array::from(vec![0, 5, 3, 1, 4, 2]);
        test_take_primitive_arrays::<Int8Type>(
            vec![None, Some(3), Some(5), Some(2), Some(3), None],
            &index,
            None,
            vec![None, None, Some(2), Some(3), Some(3), Some(5)],
        )
        .unwrap();
    }

    #[test]
    fn test_take_primitive_non_null_values() {
        let index = UInt32Array::from(vec![Some(3), None, Some(1), Some(3), Some(2)]);
        test_take_primitive_arrays::<Int8Type>(
            vec![Some(0), Some(1), Some(2), Some(3), Some(4)],
            &index,
            None,
            vec![Some(3), None, Some(1), Some(3), Some(2)],
        )
        .unwrap();
    }

    #[test]
    fn test_take_primitive_non_null() {
        let index = UInt32Array::from(vec![0, 5, 3, 1, 4, 2]);
        test_take_primitive_arrays::<Int8Type>(
            vec![Some(0), Some(3), Some(5), Some(2), Some(3), Some(1)],
            &index,
            None,
            vec![Some(0), Some(1), Some(2), Some(3), Some(3), Some(5)],
        )
        .unwrap();
    }

    #[test]
    fn test_take_primitive_nullable_indices_non_null_values_with_offset() {
        let index = UInt32Array::from(vec![Some(0), Some(1), Some(2), Some(3), None, None]);
        let index = index.slice(2, 4);
        let index = index.as_any().downcast_ref::<UInt32Array>().unwrap();

        assert_eq!(
            index,
            &UInt32Array::from(vec![Some(2), Some(3), None, None])
        );

        test_take_primitive_arrays_non_null::<Int64Type>(
            vec![0, 10, 20, 30, 40, 50],
            index,
            None,
            vec![Some(20), Some(30), None, None],
        )
        .unwrap();
    }

    #[test]
    fn test_take_primitive_nullable_indices_nullable_values_with_offset() {
        let index = UInt32Array::from(vec![Some(0), Some(1), Some(2), Some(3), None, None]);
        let index = index.slice(2, 4);
        let index = index.as_any().downcast_ref::<UInt32Array>().unwrap();

        assert_eq!(
            index,
            &UInt32Array::from(vec![Some(2), Some(3), None, None])
        );

        test_take_primitive_arrays::<Int64Type>(
            vec![None, None, Some(20), Some(30), Some(40), Some(50)],
            index,
            None,
            vec![Some(20), Some(30), None, None],
        )
        .unwrap();
    }

    #[test]
    fn test_take_primitive() {
        let index = UInt32Array::from(vec![Some(3), None, Some(1), Some(3), Some(2)]);

        // int8
        test_take_primitive_arrays::<Int8Type>(
            vec![Some(0), None, Some(2), Some(3), None],
            &index,
            None,
            vec![Some(3), None, None, Some(3), Some(2)],
        )
        .unwrap();

        // int16
        test_take_primitive_arrays::<Int16Type>(
            vec![Some(0), None, Some(2), Some(3), None],
            &index,
            None,
            vec![Some(3), None, None, Some(3), Some(2)],
        )
        .unwrap();

        // int32
        test_take_primitive_arrays::<Int32Type>(
            vec![Some(0), None, Some(2), Some(3), None],
            &index,
            None,
            vec![Some(3), None, None, Some(3), Some(2)],
        )
        .unwrap();

        // int64
        test_take_primitive_arrays::<Int64Type>(
            vec![Some(0), None, Some(2), Some(3), None],
            &index,
            None,
            vec![Some(3), None, None, Some(3), Some(2)],
        )
        .unwrap();

        // uint8
        test_take_primitive_arrays::<UInt8Type>(
            vec![Some(0), None, Some(2), Some(3), None],
            &index,
            None,
            vec![Some(3), None, None, Some(3), Some(2)],
        )
        .unwrap();

        // uint16
        test_take_primitive_arrays::<UInt16Type>(
            vec![Some(0), None, Some(2), Some(3), None],
            &index,
            None,
            vec![Some(3), None, None, Some(3), Some(2)],
        )
        .unwrap();

        // uint32
        test_take_primitive_arrays::<UInt32Type>(
            vec![Some(0), None, Some(2), Some(3), None],
            &index,
            None,
            vec![Some(3), None, None, Some(3), Some(2)],
        )
        .unwrap();

        // int64
        test_take_primitive_arrays::<Int64Type>(
            vec![Some(0), None, Some(2), Some(-15), None],
            &index,
            None,
            vec![Some(-15), None, None, Some(-15), Some(2)],
        )
        .unwrap();

        // interval_year_month
        test_take_primitive_arrays::<IntervalYearMonthType>(
            vec![Some(0), None, Some(2), Some(-15), None],
            &index,
            None,
            vec![Some(-15), None, None, Some(-15), Some(2)],
        )
        .unwrap();

        // interval_day_time
        let v1 = IntervalDayTime::new(0, 0);
        let v2 = IntervalDayTime::new(2, 0);
        let v3 = IntervalDayTime::new(-15, 0);
        test_take_primitive_arrays::<IntervalDayTimeType>(
            vec![Some(v1), None, Some(v2), Some(v3), None],
            &index,
            None,
            vec![Some(v3), None, None, Some(v3), Some(v2)],
        )
        .unwrap();

        // interval_month_day_nano
        let v1 = IntervalMonthDayNano::new(0, 0, 0);
        let v2 = IntervalMonthDayNano::new(2, 0, 0);
        let v3 = IntervalMonthDayNano::new(-15, 0, 0);
        test_take_primitive_arrays::<IntervalMonthDayNanoType>(
            vec![Some(v1), None, Some(v2), Some(v3), None],
            &index,
            None,
            vec![Some(v3), None, None, Some(v3), Some(v2)],
        )
        .unwrap();

        // duration_second
        test_take_primitive_arrays::<DurationSecondType>(
            vec![Some(0), None, Some(2), Some(-15), None],
            &index,
            None,
            vec![Some(-15), None, None, Some(-15), Some(2)],
        )
        .unwrap();

        // duration_millisecond
        test_take_primitive_arrays::<DurationMillisecondType>(
            vec![Some(0), None, Some(2), Some(-15), None],
            &index,
            None,
            vec![Some(-15), None, None, Some(-15), Some(2)],
        )
        .unwrap();

        // duration_microsecond
        test_take_primitive_arrays::<DurationMicrosecondType>(
            vec![Some(0), None, Some(2), Some(-15), None],
            &index,
            None,
            vec![Some(-15), None, None, Some(-15), Some(2)],
        )
        .unwrap();

        // duration_nanosecond
        test_take_primitive_arrays::<DurationNanosecondType>(
            vec![Some(0), None, Some(2), Some(-15), None],
            &index,
            None,
            vec![Some(-15), None, None, Some(-15), Some(2)],
        )
        .unwrap();

        // float32
        test_take_primitive_arrays::<Float32Type>(
            vec![Some(0.0), None, Some(2.21), Some(-3.1), None],
            &index,
            None,
            vec![Some(-3.1), None, None, Some(-3.1), Some(2.21)],
        )
        .unwrap();

        // float64
        test_take_primitive_arrays::<Float64Type>(
            vec![Some(0.0), None, Some(2.21), Some(-3.1), None],
            &index,
            None,
            vec![Some(-3.1), None, None, Some(-3.1), Some(2.21)],
        )
        .unwrap();
    }

    #[test]
    fn test_take_preserve_timezone() {
        let index = Int64Array::from(vec![Some(0), None]);

        let input = TimestampNanosecondArray::from(vec![
            1_639_715_368_000_000_000,
            1_639_715_368_000_000_000,
        ])
        .with_timezone("UTC".to_string());
        let result = take(&input, &index, None).unwrap();
        match result.data_type() {
            DataType::Timestamp(TimeUnit::Nanosecond, tz) => {
                assert_eq!(tz.clone(), Some("UTC".into()))
            }
            _ => panic!(),
        }
    }

    #[test]
    fn test_take_impl_primitive_with_int64_indices() {
        let index = Int64Array::from(vec![Some(3), None, Some(1), Some(3), Some(2)]);

        // int16
        test_take_impl_primitive_arrays::<Int16Type, Int64Type>(
            vec![Some(0), None, Some(2), Some(3), None],
            &index,
            None,
            vec![Some(3), None, None, Some(3), Some(2)],
        );

        // int64
        test_take_impl_primitive_arrays::<Int64Type, Int64Type>(
            vec![Some(0), None, Some(2), Some(-15), None],
            &index,
            None,
            vec![Some(-15), None, None, Some(-15), Some(2)],
        );

        // uint64
        test_take_impl_primitive_arrays::<UInt64Type, Int64Type>(
            vec![Some(0), None, Some(2), Some(3), None],
            &index,
            None,
            vec![Some(3), None, None, Some(3), Some(2)],
        );

        // duration_millisecond
        test_take_impl_primitive_arrays::<DurationMillisecondType, Int64Type>(
            vec![Some(0), None, Some(2), Some(-15), None],
            &index,
            None,
            vec![Some(-15), None, None, Some(-15), Some(2)],
        );

        // float32
        test_take_impl_primitive_arrays::<Float32Type, Int64Type>(
            vec![Some(0.0), None, Some(2.21), Some(-3.1), None],
            &index,
            None,
            vec![Some(-3.1), None, None, Some(-3.1), Some(2.21)],
        );
    }

    #[test]
    fn test_take_impl_primitive_with_uint8_indices() {
        let index = UInt8Array::from(vec![Some(3), None, Some(1), Some(3), Some(2)]);

        // int16
        test_take_impl_primitive_arrays::<Int16Type, UInt8Type>(
            vec![Some(0), None, Some(2), Some(3), None],
            &index,
            None,
            vec![Some(3), None, None, Some(3), Some(2)],
        );

        // duration_millisecond
        test_take_impl_primitive_arrays::<DurationMillisecondType, UInt8Type>(
            vec![Some(0), None, Some(2), Some(-15), None],
            &index,
            None,
            vec![Some(-15), None, None, Some(-15), Some(2)],
        );

        // float32
        test_take_impl_primitive_arrays::<Float32Type, UInt8Type>(
            vec![Some(0.0), None, Some(2.21), Some(-3.1), None],
            &index,
            None,
            vec![Some(-3.1), None, None, Some(-3.1), Some(2.21)],
        );
    }

    #[test]
    fn test_take_bool() {
        let index = UInt32Array::from(vec![Some(3), None, Some(1), Some(3), Some(2)]);
        // boolean
        test_take_boolean_arrays(
            vec![Some(false), None, Some(true), Some(false), None],
            &index,
            None,
            vec![Some(false), None, None, Some(false), Some(true)],
        );
    }

    #[test]
    fn test_take_bool_nullable_index() {
        // indices where the masked invalid elements would be out of bounds
        let index_data = ArrayData::try_new(
            DataType::UInt32,
            6,
            Some(Buffer::from_iter(vec![
                false, true, false, true, false, true,
            ])),
            0,
            vec![Buffer::from_iter(vec![99, 0, 999, 1, 9999, 2])],
            vec![],
        )
        .unwrap();
        let index = UInt32Array::from(index_data);
        test_take_boolean_arrays(
            vec![Some(true), None, Some(false)],
            &index,
            None,
            vec![None, Some(true), None, None, None, Some(false)],
        );
    }

    #[test]
    fn test_take_bool_nullable_index_nonnull_values() {
        // indices where the masked invalid elements would be out of bounds
        let index_data = ArrayData::try_new(
            DataType::UInt32,
            6,
            Some(Buffer::from_iter(vec![
                false, true, false, true, false, true,
            ])),
            0,
            vec![Buffer::from_iter(vec![99, 0, 999, 1, 9999, 2])],
            vec![],
        )
        .unwrap();
        let index = UInt32Array::from(index_data);
        test_take_boolean_arrays(
            vec![Some(true), Some(true), Some(false)],
            &index,
            None,
            vec![None, Some(true), None, Some(true), None, Some(false)],
        );
    }

    #[test]
    fn test_take_bool_with_offset() {
        let index = UInt32Array::from(vec![Some(3), None, Some(1), Some(3), Some(2), None]);
        let index = index.slice(2, 4);
        let index = index
            .as_any()
            .downcast_ref::<PrimitiveArray<UInt32Type>>()
            .unwrap();

        // boolean
        test_take_boolean_arrays(
            vec![Some(false), None, Some(true), Some(false), None],
            index,
            None,
            vec![None, Some(false), Some(true), None],
        );
    }

    #[test]
    // Null indices + sliced source boolean array — exercises src_offset in the sparse take_bits path.
    fn test_take_bool_nullable_index_sliced_source() {
        let source = BooleanArray::from(vec![Some(true), Some(false), Some(true), Some(false)]);
        let source = source.slice(1, 3); // logical: [false, true, false], offset=1
        let source = source;

        let indices = UInt32Array::from(vec![Some(2), None, Some(0)]);
        let result = take(&source, &indices, None).unwrap();
        let result = result.as_any().downcast_ref::<BooleanArray>().unwrap();

        let expected = BooleanArray::from(vec![Some(false), None, Some(false)]);
        assert_eq!(result, &expected);
    }

    #[test]
    // >8 elements: exercises the 8-at-a-time unrolled byte packing in take_bits.
    fn test_take_bool_no_nulls_multi_byte() {
        let source = BooleanArray::from(vec![
            true, false, true, true, false, false, true, false, true, true,
        ]);
        let indices = UInt32Array::from(vec![0, 2, 4, 6, 8, 1, 3, 5, 7, 9]);
        let result = take(&source, &indices, None).unwrap();
        let result = result.as_any().downcast_ref::<BooleanArray>().unwrap();
        let expected = BooleanArray::from(vec![
            true, true, false, true, true, false, true, false, false, true,
        ]);
        assert_eq!(result, &expected);
    }

    #[test]
    // Sliced source: verifies src_offset is applied when no null indices.
    fn test_take_bool_no_nulls_sliced_source() {
        let source = BooleanArray::from(vec![true, false, true, false, true]);
        let source = source.slice(2, 3); // [true, false, true], offset=2
        let source = source.as_any().downcast_ref::<BooleanArray>().unwrap();
        let indices = UInt32Array::from(vec![2, 0, 1]);
        let result = take(source, &indices, None).unwrap();
        let result = result.as_any().downcast_ref::<BooleanArray>().unwrap();
        let expected = BooleanArray::from(vec![true, true, false]);
        assert_eq!(result, &expected);
    }

    #[test]
    // Nullable source, >8 elements: exercises the 8-at-a-time unrolled byte packing in take_bits_with_validity.
    fn test_take_bool_nullable_values_multi_byte() {
        let source = BooleanArray::from(vec![
            Some(true),
            None,
            Some(false),
            Some(true),
            None,
            Some(false),
            Some(true),
            Some(false),
            Some(true),
            None,
        ]);
        let indices = UInt32Array::from(vec![0, 2, 4, 6, 8, 1, 3, 5, 7, 9]);
        let result = take(&source, &indices, None).unwrap();
        let result = result.as_any().downcast_ref::<BooleanArray>().unwrap();
        let expected = BooleanArray::from(vec![
            Some(true),
            Some(false),
            None,
            Some(true),
            Some(true),
            None,
            Some(true),
            Some(false),
            Some(false),
            None,
        ]);
        assert_eq!(result, &expected);
    }

    #[test]
    // Nullable source, null indices, sliced source: verifies src_offset with both null paths.
    fn test_take_bool_nullable_values_sliced_source_null_indices() {
        let source =
            BooleanArray::from(vec![Some(true), Some(false), None, Some(true), Some(false)]);
        let source = source.slice(1, 4); // [false, null, true, false], offset=1
        let source = source.as_any().downcast_ref::<BooleanArray>().unwrap();
        let indices = UInt32Array::from(vec![Some(3), None, Some(1), Some(0)]);
        let result = take(source, &indices, None).unwrap();
        let result = result.as_any().downcast_ref::<BooleanArray>().unwrap();
        let expected = BooleanArray::from(vec![Some(false), None, None, Some(false)]);
        assert_eq!(result, &expected);
    }

    #[test]
    #[should_panic(expected = "assertion failed: idx < self.bit_len")]
    fn test_take_bool_oob_no_check_bounds_panics() {
        let array = BooleanArray::from(vec![true, false, true]);
        let indices = Int32Array::from(vec![0, 1, 10]);
        take(&array, &indices, None).unwrap();
    }

    fn _test_take_string<'a, K>()
    where
        K: Array + PartialEq + From<Vec<Option<&'a str>>> + 'static,
    {
        let index = UInt32Array::from(vec![Some(3), None, Some(1), Some(3), Some(4)]);

        let array = K::from(vec![
            Some("one"),
            None,
            Some("three"),
            Some("four"),
            Some("five"),
        ]);
        let actual = take(&array, &index, None).unwrap();
        assert_eq!(actual.len(), index.len());

        let actual = actual.as_any().downcast_ref::<K>().unwrap();

        let expected = K::from(vec![Some("four"), None, None, Some("four"), Some("five")]);

        assert_eq!(actual, &expected);
    }

    #[test]
    fn test_take_string() {
        _test_take_string::<StringArray>()
    }

    #[test]
    fn test_take_large_string() {
        _test_take_string::<LargeStringArray>()
    }

    #[test]
    fn test_take_slice_string() {
        let strings = StringArray::from(vec![Some("hello"), None, Some("world"), None, Some("hi")]);
        let indices = Int32Array::from(vec![Some(0), Some(1), None, Some(0), Some(2)]);
        let indices_slice = indices.slice(1, 4);
        let expected = StringArray::from(vec![None, None, Some("hello"), Some("world")]);
        let result = take(&strings, &indices_slice, None).unwrap();
        assert_eq!(result.as_ref(), &expected);
    }

    /// Take from a *sliced* byte array, i.e. one whose value offsets do not
    /// start at zero. This exercises copying byte data out of an array with a
    /// non-zero base offset for both the no-null fast path and the nullable
    /// path (null indices and selected null values).
    #[test]
    fn test_take_bytes_sliced_values() {
        let values = StringArray::from(vec![
            Some("aaa"),
            Some("bbb"),
            None,
            Some("ccccc"),
            Some("dd"),
            None,
            Some("eeee"),
        ]);
        // Slice so the underlying value offsets no longer start at 0:
        // sliced == [None, "ccccc", "dd", None, "eeee"]
        let sliced = values.slice(2, 5);

        // Fast path: every output slot is valid (no null indices, no null
        // values selected).
        let indices = Int32Array::from(vec![1, 2, 4, 1]);
        let result = take(&sliced, &indices, None).unwrap();
        let expected =
            StringArray::from(vec![Some("ccccc"), Some("dd"), Some("eeee"), Some("ccccc")]);
        assert_eq!(result.as_string::<i32>(), &expected);

        // Nullable path: a null index (position 1) and selected null values
        // (sliced indices 0 and 3 are null).
        let indices = Int32Array::from(vec![Some(1), None, Some(0), Some(4), Some(3)]);
        let result = take(&sliced, &indices, None).unwrap();
        let expected = StringArray::from(vec![Some("ccccc"), None, None, Some("eeee"), None]);
        assert_eq!(result.as_string::<i32>(), &expected);
    }

    fn _test_byte_view<T>()
    where
        T: ByteViewType,
        str: AsRef<T::Native>,
        T::Native: PartialEq,
    {
        let index = UInt32Array::from(vec![Some(3), None, Some(1), Some(3), Some(4), Some(2)]);
        let array = {
            // ["hello", "world", null, "large payload over 12 bytes", "lulu"]
            let mut builder = GenericByteViewBuilder::<T>::new();
            builder.append_value("hello");
            builder.append_value("world");
            builder.append_null();
            builder.append_value("large payload over 12 bytes");
            builder.append_value("lulu");
            builder.finish()
        };

        let actual = take(&array, &index, None).unwrap();

        assert_eq!(actual.len(), index.len());
        let actual_buffers = actual.as_byte_view::<T>().data_buffers();
        let input_buffers = array.data_buffers();
        assert!(Arc::ptr_eq(actual_buffers, input_buffers));

        let expected = {
            // ["large payload over 12 bytes", null, "world", "large payload over 12 bytes", "lulu", null]
            let mut builder = GenericByteViewBuilder::<T>::new();
            builder.append_value("large payload over 12 bytes");
            builder.append_null();
            builder.append_value("world");
            builder.append_value("large payload over 12 bytes");
            builder.append_value("lulu");
            builder.append_null();
            builder.finish()
        };

        assert_eq!(actual.as_ref(), &expected);
    }

    #[test]
    fn test_take_string_view() {
        _test_byte_view::<StringViewType>()
    }

    #[test]
    fn test_take_binary_view() {
        _test_byte_view::<BinaryViewType>()
    }

    macro_rules! test_take_list {
        ($offset_type:ty, $list_data_type:ident, $list_array_type:ident) => {{
            // Construct a value array, [[0,0,0], [-1,-2,-1], [], [2,3]]
            let value_data = Int32Array::from(vec![0, 0, 0, -1, -2, -1, 2, 3]).into_data();
            // Construct offsets
            let value_offsets: [$offset_type; 5] = [0, 3, 6, 6, 8];
            let value_offsets = Buffer::from_slice_ref(&value_offsets);
            // Construct a list array from the above two
            let list_data_type =
                DataType::$list_data_type(Arc::new(Field::new_list_field(DataType::Int32, false)));
            let list_data = ArrayData::builder(list_data_type.clone())
                .len(4)
                .add_buffer(value_offsets)
                .add_child_data(value_data)
                .build()
                .unwrap();
            let list_array = $list_array_type::from(list_data);

            // index returns: [[2,3], null, [-1,-2,-1], [], [0,0,0]]
            let index = UInt32Array::from(vec![Some(3), None, Some(1), Some(2), Some(0)]);

            let a = take(&list_array, &index, None).unwrap();
            let a: &$list_array_type = a.as_any().downcast_ref::<$list_array_type>().unwrap();

            // construct a value array with expected results:
            // [[2,3], null, [-1,-2,-1], [], [0,0,0]]
            let expected_data = Int32Array::from(vec![
                Some(2),
                Some(3),
                Some(-1),
                Some(-2),
                Some(-1),
                Some(0),
                Some(0),
                Some(0),
            ])
            .into_data();
            // construct offsets
            let expected_offsets: [$offset_type; 6] = [0, 2, 2, 5, 5, 8];
            let expected_offsets = Buffer::from_slice_ref(&expected_offsets);
            // construct list array from the two
            let expected_list_data = ArrayData::builder(list_data_type)
                .len(5)
                // null buffer remains the same as only the indices have nulls
                .nulls(index.nulls().cloned())
                .add_buffer(expected_offsets)
                .add_child_data(expected_data)
                .build()
                .unwrap();
            let expected_list_array = $list_array_type::from(expected_list_data);

            assert_eq!(a, &expected_list_array);
        }};
    }

    macro_rules! test_take_list_with_value_nulls {
        ($offset_type:ty, $list_data_type:ident, $list_array_type:ident) => {{
            // Construct a value array, [[0,null,0], [-1,-2,3], [null], [5,null]]
            let value_data = Int32Array::from(vec![
                Some(0),
                None,
                Some(0),
                Some(-1),
                Some(-2),
                Some(3),
                None,
                Some(5),
                None,
            ])
            .into_data();
            // Construct offsets
            let value_offsets: [$offset_type; 5] = [0, 3, 6, 7, 9];
            let value_offsets = Buffer::from_slice_ref(&value_offsets);
            // Construct a list array from the above two
            let list_data_type =
                DataType::$list_data_type(Arc::new(Field::new_list_field(DataType::Int32, true)));
            let list_data = ArrayData::builder(list_data_type.clone())
                .len(4)
                .add_buffer(value_offsets)
                .null_bit_buffer(Some(Buffer::from([0b11111111])))
                .add_child_data(value_data)
                .build()
                .unwrap();
            let list_array = $list_array_type::from(list_data);

            // index returns: [[null], null, [-1,-2,3], [2,null], [0,null,0]]
            let index = UInt32Array::from(vec![Some(2), None, Some(1), Some(3), Some(0)]);

            let a = take(&list_array, &index, None).unwrap();
            let a: &$list_array_type = a.as_any().downcast_ref::<$list_array_type>().unwrap();

            // construct a value array with expected results:
            // [[null], null, [-1,-2,3], [5,null], [0,null,0]]
            let expected_data = Int32Array::from(vec![
                None,
                Some(-1),
                Some(-2),
                Some(3),
                Some(5),
                None,
                Some(0),
                None,
                Some(0),
            ])
            .into_data();
            // construct offsets
            let expected_offsets: [$offset_type; 6] = [0, 1, 1, 4, 6, 9];
            let expected_offsets = Buffer::from_slice_ref(&expected_offsets);
            // construct list array from the two
            let expected_list_data = ArrayData::builder(list_data_type)
                .len(5)
                // null buffer remains the same as only the indices have nulls
                .nulls(index.nulls().cloned())
                .add_buffer(expected_offsets)
                .add_child_data(expected_data)
                .build()
                .unwrap();
            let expected_list_array = $list_array_type::from(expected_list_data);

            assert_eq!(a, &expected_list_array);
        }};
    }

    macro_rules! test_take_list_with_nulls {
        ($offset_type:ty, $list_data_type:ident, $list_array_type:ident) => {{
            // Construct a value array, [[0,null,0], [-1,-2,3], null, [5,null]]
            let value_data = Int32Array::from(vec![
                Some(0),
                None,
                Some(0),
                Some(-1),
                Some(-2),
                Some(3),
                Some(5),
                None,
            ])
            .into_data();
            // Construct offsets
            let value_offsets: [$offset_type; 5] = [0, 3, 6, 6, 8];
            let value_offsets = Buffer::from_slice_ref(&value_offsets);
            // Construct a list array from the above two
            let list_data_type =
                DataType::$list_data_type(Arc::new(Field::new_list_field(DataType::Int32, true)));
            let list_data = ArrayData::builder(list_data_type.clone())
                .len(4)
                .add_buffer(value_offsets)
                .null_bit_buffer(Some(Buffer::from([0b11111011])))
                .add_child_data(value_data)
                .build()
                .unwrap();
            let list_array = $list_array_type::from(list_data);

            // index returns: [null, null, [-1,-2,3], [5,null], [0,null,0]]
            let index = UInt32Array::from(vec![Some(2), None, Some(1), Some(3), Some(0)]);

            let a = take(&list_array, &index, None).unwrap();
            let a: &$list_array_type = a.as_any().downcast_ref::<$list_array_type>().unwrap();

            // construct a value array with expected results:
            // [null, null, [-1,-2,3], [5,null], [0,null,0]]
            let expected_data = Int32Array::from(vec![
                Some(-1),
                Some(-2),
                Some(3),
                Some(5),
                None,
                Some(0),
                None,
                Some(0),
            ])
            .into_data();
            // construct offsets
            let expected_offsets: [$offset_type; 6] = [0, 0, 0, 3, 5, 8];
            let expected_offsets = Buffer::from_slice_ref(&expected_offsets);
            // construct list array from the two
            let mut null_bits: [u8; 1] = [0; 1];
            bit_util::set_bit(&mut null_bits, 2);
            bit_util::set_bit(&mut null_bits, 3);
            bit_util::set_bit(&mut null_bits, 4);
            let expected_list_data = ArrayData::builder(list_data_type)
                .len(5)
                // null buffer must be recalculated as both values and indices have nulls
                .null_bit_buffer(Some(Buffer::from(null_bits)))
                .add_buffer(expected_offsets)
                .add_child_data(expected_data)
                .build()
                .unwrap();
            let expected_list_array = $list_array_type::from(expected_list_data);

            assert_eq!(a, &expected_list_array);
        }};
    }

    fn test_take_list_view_generic<OffsetType: OffsetSizeTrait, ValuesType: ArrowPrimitiveType, F>(
        values: Vec<Option<Vec<Option<ValuesType::Native>>>>,
        take_indices: Vec<Option<usize>>,
        expected: Vec<Option<Vec<Option<ValuesType::Native>>>>,
        mapper: F,
    ) where
        F: Fn(GenericListViewArray<OffsetType>) -> GenericListViewArray<OffsetType>,
    {
        let mut list_view_array =
            GenericListViewBuilder::<OffsetType, _>::new(PrimitiveBuilder::<ValuesType>::new());

        for value in values {
            list_view_array.append_option(value);
        }
        let list_view_array = list_view_array.finish();
        let list_view_array = mapper(list_view_array);

        let mut indices = UInt64Builder::new();
        for idx in take_indices {
            indices.append_option(idx.map(|i| i.to_u64().unwrap()));
        }
        let indices = indices.finish();

        let taken = take(&list_view_array, &indices, None)
            .unwrap()
            .as_list_view()
            .clone();

        let mut expected_array =
            GenericListViewBuilder::<OffsetType, _>::new(PrimitiveBuilder::<ValuesType>::new());
        for value in expected {
            expected_array.append_option(value);
        }
        let expected_array = expected_array.finish();

        assert_eq!(taken, expected_array);
    }

    macro_rules! list_view_test_case {
        (values: $values:expr, indices: $indices:expr, expected: $expected: expr) => {{
            test_take_list_view_generic::<i32, Int8Type, _>($values, $indices, $expected, |x| x);
            test_take_list_view_generic::<i64, Int8Type, _>($values, $indices, $expected, |x| x);
        }};
        (values: $values:expr, transform: $fn:expr, indices: $indices:expr, expected: $expected: expr) => {{
            test_take_list_view_generic::<i32, Int8Type, _>($values, $indices, $expected, $fn);
            test_take_list_view_generic::<i64, Int8Type, _>($values, $indices, $expected, $fn);
        }};
    }

    fn do_take_fixed_size_list_test<T>(
        length: <Int32Type as ArrowPrimitiveType>::Native,
        input_data: Vec<Option<Vec<Option<T::Native>>>>,
        indices: Vec<<UInt32Type as ArrowPrimitiveType>::Native>,
        expected_data: Vec<Option<Vec<Option<T::Native>>>>,
    ) where
        T: ArrowPrimitiveType,
        PrimitiveArray<T>: From<Vec<Option<T::Native>>>,
    {
        let indices = UInt32Array::from(indices);

        let input_array = FixedSizeListArray::from_iter_primitive::<T, _, _>(input_data, length);

        let output =
            take_fixed_size_list::<_, true>(&input_array, &indices, length as u32).unwrap();

        let expected = FixedSizeListArray::from_iter_primitive::<T, _, _>(expected_data, length);

        assert_eq!(&output, &expected)
    }

    #[test]
    // Fast path (primitive child, no child nulls) with null indices — verifies offset backfill for null slots.
    fn test_take_list_primitive_child_null_indices() {
        // Row sizes deliberately vary (1, 3, 2) so the test exercises
        // non-uniform offset arithmetic, not just uniform stride.
        let list = ListArray::from_iter_primitive::<Int32Type, _, _>(vec![
            Some(vec![Some(1)]),
            Some(vec![Some(2), Some(3), Some(4)]),
            Some(vec![Some(5), Some(6)]),
        ]);
        let indices = Int32Array::from(vec![Some(2), None, Some(0), Some(1)]);
        let result = take(&list, &indices, None).unwrap();
        let result = result.as_any().downcast_ref::<ListArray>().unwrap();

        let expected = ListArray::from_iter_primitive::<Int32Type, _, _>(vec![
            Some(vec![Some(5), Some(6)]),
            None,
            Some(vec![Some(1)]),
            Some(vec![Some(2), Some(3), Some(4)]),
        ]);
        assert_eq!(result, &expected);
    }

    #[test]
    fn test_take_list() {
        test_take_list!(i32, List, ListArray);
    }

    #[test]
    fn test_take_large_list() {
        test_take_list!(i64, LargeList, LargeListArray);
    }

    #[test]
    fn test_take_list_with_value_nulls() {
        test_take_list_with_value_nulls!(i32, List, ListArray);
    }

    #[test]
    fn test_take_large_list_with_value_nulls() {
        test_take_list_with_value_nulls!(i64, LargeList, LargeListArray);
    }

    #[test]
    fn test_test_take_list_with_nulls() {
        test_take_list_with_nulls!(i32, List, ListArray);
    }

    #[test]
    fn test_test_take_large_list_with_nulls() {
        test_take_list_with_nulls!(i64, LargeList, LargeListArray);
    }

    #[test]
    fn test_test_take_list_view_reversed() {
        // Take reversed indices
        list_view_test_case! {
            values: vec![
                Some(vec![Some(1), None, Some(3)]),
                None,
                Some(vec![Some(7), Some(8), None]),
            ],
            indices: vec![Some(2), Some(1), Some(0)],
            expected: vec![
                Some(vec![Some(7), Some(8), None]),
                None,
                Some(vec![Some(1), None, Some(3)]),
            ]
        }
    }

    #[test]
    fn test_take_list_view_null_indices() {
        // Take with null indices
        list_view_test_case! {
            values: vec![
                Some(vec![Some(1), None, Some(3)]),
                None,
                Some(vec![Some(7), Some(8), None]),
            ],
            indices: vec![None, Some(0), None],
            expected: vec![None, Some(vec![Some(1), None, Some(3)]), None]
        }
    }

    #[test]
    fn test_take_list_view_null_values() {
        // Take at null values
        list_view_test_case! {
            values: vec![
                Some(vec![Some(1), None, Some(3)]),
                None,
                Some(vec![Some(7), Some(8), None]),
            ],
            indices: vec![Some(1), Some(1), Some(1), None, None],
            expected: vec![None; 5]
        }
    }

    #[test]
    fn test_take_list_view_sliced() {
        // Take null indices/values, with slicing.
        list_view_test_case! {
            values: vec![
                Some(vec![Some(1)]),
                None,
                None,
                Some(vec![Some(2), Some(3)]),
                Some(vec![Some(4), Some(5)]),
                None,
            ],
            transform: |l| l.slice(2, 4),
            indices: vec![Some(0), Some(3), None, Some(1), Some(2)],
            expected: vec![
                None, None, None, Some(vec![Some(2), Some(3)]), Some(vec![Some(4), Some(5)])
            ]
        }
    }

    #[test]
    fn test_take_fixed_size_list() {
        do_take_fixed_size_list_test::<Int32Type>(
            3,
            vec![
                Some(vec![None, Some(1), Some(2)]),
                Some(vec![Some(3), Some(4), None]),
                Some(vec![Some(6), Some(7), Some(8)]),
            ],
            vec![2, 1, 0],
            vec![
                Some(vec![Some(6), Some(7), Some(8)]),
                Some(vec![Some(3), Some(4), None]),
                Some(vec![None, Some(1), Some(2)]),
            ],
        );

        do_take_fixed_size_list_test::<UInt8Type>(
            1,
            vec![
                Some(vec![Some(1)]),
                Some(vec![Some(2)]),
                Some(vec![Some(3)]),
                Some(vec![Some(4)]),
                Some(vec![Some(5)]),
                Some(vec![Some(6)]),
                Some(vec![Some(7)]),
                Some(vec![Some(8)]),
            ],
            vec![2, 7, 0],
            vec![
                Some(vec![Some(3)]),
                Some(vec![Some(8)]),
                Some(vec![Some(1)]),
            ],
        );

        do_take_fixed_size_list_test::<UInt64Type>(
            3,
            vec![
                Some(vec![Some(10), Some(11), Some(12)]),
                Some(vec![Some(13), Some(14), Some(15)]),
                None,
                Some(vec![Some(16), Some(17), Some(18)]),
            ],
            vec![3, 2, 1, 2, 0],
            vec![
                Some(vec![Some(16), Some(17), Some(18)]),
                None,
                Some(vec![Some(13), Some(14), Some(15)]),
                None,
                Some(vec![Some(10), Some(11), Some(12)]),
            ],
        );
    }

    #[test]
    fn test_take_fixed_size_binary_with_nulls_indices() {
        let fsb = FixedSizeBinaryArray::try_from_sparse_iter_with_size(
            [
                Some(vec![0x01, 0x01, 0x01, 0x01]),
                Some(vec![0x02, 0x02, 0x02, 0x02]),
                Some(vec![0x03, 0x03, 0x03, 0x03]),
                Some(vec![0x04, 0x04, 0x04, 0x04]),
            ]
            .into_iter(),
            4,
        )
        .unwrap();

        // The two middle indices are null -> Should be null in the output.
        let indices = UInt32Array::from(vec![Some(0), None, None, Some(3)]);

        let result = take_fixed_size_binary::<_, true>(&fsb, &indices, 4).unwrap();
        assert_eq!(result.len(), 4);
        assert_eq!(result.null_count(), 2);
        assert_eq!(
            result.nulls().unwrap().iter().collect::<Vec<_>>(),
            vec![true, false, false, true]
        );
    }

    /// The [`take_fixed_size_binary`] kernel contains optimizations that provide a faster
    /// implementation for commonly-used value lengths. This test uses a value length that is not
    /// optimized to test both code paths.
    #[test]
    fn test_take_fixed_size_binary_with_nulls_indices_not_optimized_length() {
        let fsb = FixedSizeBinaryArray::try_from_sparse_iter_with_size(
            [
                Some(vec![0x01, 0x01, 0x01, 0x01, 0x01]),
                Some(vec![0x02, 0x02, 0x02, 0x02, 0x01]),
                Some(vec![0x03, 0x03, 0x03, 0x03, 0x01]),
                Some(vec![0x04, 0x04, 0x04, 0x04, 0x01]),
            ]
            .into_iter(),
            5,
        )
        .unwrap();

        // The two middle indices are null -> Should be null in the output.
        let indices = UInt32Array::from(vec![Some(0), None, None, Some(3)]);

        let result = take_fixed_size_binary::<_, true>(&fsb, &indices, 5).unwrap();
        assert_eq!(result.len(), 4);
        assert_eq!(result.null_count(), 2);
        assert_eq!(
            result.nulls().unwrap().iter().collect::<Vec<_>>(),
            vec![true, false, false, true]
        );
    }

    #[test]
    #[should_panic(expected = "index out of bounds: the len is 4 but the index is 1000")]
    fn test_take_list_out_of_bounds() {
        // Construct a value array, [[0,0,0], [-1,-2,-1], [2,3]]
        let value_data = Int32Array::from(vec![0, 0, 0, -1, -2, -1, 2, 3]).into_data();
        // Construct offsets
        let value_offsets = Buffer::from_slice_ref([0, 3, 6, 8]);
        // Construct a list array from the above two
        let list_data_type =
            DataType::List(Arc::new(Field::new_list_field(DataType::Int32, false)));
        let list_data = ArrayData::builder(list_data_type)
            .len(3)
            .add_buffer(value_offsets)
            .add_child_data(value_data)
            .build()
            .unwrap();
        let list_array = ListArray::from(list_data);

        let index = UInt32Array::from(vec![1000]);

        // A panic is expected here since we have not supplied the check_bounds
        // option.
        take(&list_array, &index, None).unwrap();
    }

    #[test]
    fn test_take_map() {
        let values = Int32Array::from(vec![1, 2, 3, 4]);
        let array =
            MapArray::new_from_strings(vec!["a", "b", "c", "a"].into_iter(), &values, &[0, 3, 4])
                .unwrap();

        let index = UInt32Array::from(vec![0]);

        let result = take(&array, &index, None).unwrap();
        let expected: ArrayRef = Arc::new(
            MapArray::new_from_strings(
                vec!["a", "b", "c"].into_iter(),
                &values.slice(0, 3),
                &[0, 3],
            )
            .unwrap(),
        );
        assert_eq!(&expected, &result);
    }

    #[test]
    fn test_take_struct() {
        let array = create_test_struct(vec![
            Some((Some(true), Some(42))),
            Some((Some(false), Some(28))),
            Some((Some(false), Some(19))),
            Some((Some(true), Some(31))),
            None,
        ]);

        let index = UInt32Array::from(vec![0, 3, 1, 0, 2, 4]);
        let actual = take(&array, &index, None).unwrap();
        let actual: &StructArray = actual.as_any().downcast_ref::<StructArray>().unwrap();
        assert_eq!(index.len(), actual.len());
        assert_eq!(1, actual.null_count());

        let expected = create_test_struct(vec![
            Some((Some(true), Some(42))),
            Some((Some(true), Some(31))),
            Some((Some(false), Some(28))),
            Some((Some(true), Some(42))),
            Some((Some(false), Some(19))),
            None,
        ]);

        assert_eq!(&expected, actual);

        let nulls = NullBuffer::from(&[false, true, false, true, false, true]);
        let empty_struct_arr = StructArray::new_empty_fields(6, Some(nulls));
        let index = UInt32Array::from(vec![0, 2, 1, 4]);
        let actual = take(&empty_struct_arr, &index, None).unwrap();

        let expected_nulls = NullBuffer::from(&[false, false, true, false]);
        let expected_struct_arr = StructArray::new_empty_fields(4, Some(expected_nulls));
        assert_eq!(&expected_struct_arr, actual.as_struct());
    }

    #[test]
    fn test_take_struct_with_null_indices() {
        let array = create_test_struct(vec![
            Some((Some(true), Some(42))),
            Some((Some(false), Some(28))),
            Some((Some(false), Some(19))),
            Some((Some(true), Some(31))),
            None,
        ]);

        let index = UInt32Array::from(vec![None, Some(3), Some(1), None, Some(0), Some(4)]);
        let actual = take(&array, &index, None).unwrap();
        let actual: &StructArray = actual.as_any().downcast_ref::<StructArray>().unwrap();
        assert_eq!(index.len(), actual.len());
        assert_eq!(3, actual.null_count()); // 2 because of indices, 1 because of struct array

        let expected = create_test_struct(vec![
            None,
            Some((Some(true), Some(31))),
            Some((Some(false), Some(28))),
            None,
            Some((Some(true), Some(42))),
            None,
        ]);

        assert_eq!(&expected, actual);
    }

    #[test]
    fn test_take_out_of_bounds() {
        let index = UInt32Array::from(vec![Some(3), None, Some(1), Some(3), Some(6)]);
        let take_opt = TakeOptions { check_bounds: true };

        // int64
        let result = test_take_primitive_arrays::<Int64Type>(
            vec![Some(0), None, Some(2), Some(3), None],
            &index,
            Some(take_opt),
            vec![None],
        );
        assert!(result.is_err());
    }

    #[test]
    #[should_panic(expected = "index out of bounds: the len is 4 but the index is 1000")]
    fn test_take_out_of_bounds_panic() {
        let index = UInt32Array::from(vec![Some(1000)]);

        test_take_primitive_arrays::<Int64Type>(
            vec![Some(0), Some(1), Some(2), Some(3)],
            &index,
            None,
            vec![None],
        )
        .unwrap();
    }

    #[test]
    fn test_null_array_smaller_than_indices() {
        let values = NullArray::new(2);
        let indices = UInt32Array::from(vec![Some(0), None, Some(15)]);

        let result = take(&values, &indices, None).unwrap();
        let expected: ArrayRef = Arc::new(NullArray::new(3));
        assert_eq!(&result, &expected);
    }

    #[test]
    fn test_null_array_larger_than_indices() {
        let values = NullArray::new(5);
        let indices = UInt32Array::from(vec![Some(0), None, Some(15)]);

        let result = take(&values, &indices, None).unwrap();
        let expected: ArrayRef = Arc::new(NullArray::new(3));
        assert_eq!(&result, &expected);
    }

    #[test]
    fn test_null_array_indices_out_of_bounds() {
        let values = NullArray::new(5);
        let indices = UInt32Array::from(vec![Some(0), None, Some(15)]);

        let result = take(&values, &indices, Some(TakeOptions { check_bounds: true }));
        assert_eq!(
            result.unwrap_err().to_string(),
            "Compute error: Array index out of bounds, cannot get item at index 15 from 5 entries"
        );
    }

    #[test]
    fn test_take_dict() {
        let mut dict_builder = StringDictionaryBuilder::<Int16Type>::new();

        dict_builder.append("foo").unwrap();
        dict_builder.append("bar").unwrap();
        dict_builder.append("").unwrap();
        dict_builder.append_null();
        dict_builder.append("foo").unwrap();
        dict_builder.append("bar").unwrap();
        dict_builder.append("bar").unwrap();
        dict_builder.append("foo").unwrap();

        let array = dict_builder.finish();
        let dict_values = array.values().clone();
        let dict_values = dict_values.as_any().downcast_ref::<StringArray>().unwrap();

        let indices = UInt32Array::from(vec![
            Some(0), // first "foo"
            Some(7), // last "foo"
            None,    // null index should return null
            Some(5), // second "bar"
            Some(6), // another "bar"
            Some(2), // empty string
            Some(3), // input is null at this index
        ]);

        let result = take(&array, &indices, None).unwrap();
        let result = result
            .as_any()
            .downcast_ref::<DictionaryArray<Int16Type>>()
            .unwrap();

        let result_values: StringArray = result.values().to_data().into();

        // dictionary values should stay the same
        let expected_values = StringArray::from(vec!["foo", "bar", ""]);
        assert_eq!(&expected_values, dict_values);
        assert_eq!(&expected_values, &result_values);

        let expected_keys = Int16Array::from(vec![
            Some(0),
            Some(0),
            None,
            Some(1),
            Some(1),
            Some(2),
            None,
        ]);
        assert_eq!(result.keys(), &expected_keys);
    }

    fn build_generic_list<S, T>(data: Vec<Option<Vec<T::Native>>>) -> GenericListArray<S>
    where
        S: OffsetSizeTrait + 'static,
        T: ArrowPrimitiveType,
        PrimitiveArray<T>: From<Vec<Option<T::Native>>>,
    {
        GenericListArray::from_iter_primitive::<T, _, _>(
            data.iter()
                .map(|x| x.as_ref().map(|x| x.iter().map(|x| Some(*x)))),
        )
    }

    fn test_take_sliced_list_generic<S: OffsetSizeTrait + 'static>() {
        let list = build_generic_list::<S, Int32Type>(vec![
            Some(vec![0, 1]),
            Some(vec![2, 3, 4]),
            None,
            Some(vec![]),
            Some(vec![5, 6]),
            Some(vec![7]),
        ]);
        let sliced = list.slice(1, 4);
        let indices = UInt32Array::from(vec![Some(3), Some(0), None, Some(2), Some(1)]);

        let taken = take(&sliced, &indices, None).unwrap();
        let taken = taken.as_list::<S>();

        let expected = build_generic_list::<S, Int32Type>(vec![
            Some(vec![5, 6]),
            Some(vec![2, 3, 4]),
            None,
            Some(vec![]),
            None,
        ]);

        assert_eq!(taken, &expected);
    }

    fn test_take_sliced_list_with_value_nulls_generic<S: OffsetSizeTrait + 'static>() {
        let list = GenericListArray::<S>::from_iter_primitive::<Int32Type, _, _>(vec![
            Some(vec![Some(10)]),
            Some(vec![None, Some(1)]),
            None,
            Some(vec![Some(2), None]),
            Some(vec![]),
            Some(vec![Some(3)]),
        ]);
        let sliced = list.slice(1, 4);
        let indices = UInt32Array::from(vec![Some(2), Some(0), None, Some(3), Some(1)]);

        let taken = take(&sliced, &indices, None).unwrap();
        let taken = taken.as_list::<S>();

        let expected = GenericListArray::<S>::from_iter_primitive::<Int32Type, _, _>(vec![
            Some(vec![Some(2), None]),
            Some(vec![None, Some(1)]),
            None,
            Some(vec![]),
            None,
        ]);

        assert_eq!(taken, &expected);
    }

    #[test]
    fn test_take_sliced_list() {
        test_take_sliced_list_generic::<i32>();
    }

    #[test]
    fn test_take_sliced_large_list() {
        test_take_sliced_list_generic::<i64>();
    }

    #[test]
    fn test_take_sliced_list_with_value_nulls() {
        test_take_sliced_list_with_value_nulls_generic::<i32>();
    }

    #[test]
    fn test_take_sliced_large_list_with_value_nulls() {
        test_take_sliced_list_with_value_nulls_generic::<i64>();
    }

    #[test]
    fn test_take_runs() {
        let logical_array: Vec<i32> = vec![1_i32, 1, 2, 2, 1, 1, 1, 2, 2, 1, 1, 2, 2];

        let mut builder = PrimitiveRunBuilder::<Int32Type, Int32Type>::new();
        builder.extend(logical_array.into_iter().map(Some));
        let run_array = builder.finish();

        let take_indices: PrimitiveArray<Int32Type> =
            vec![7, 2, 3, 7, 11, 4, 6].into_iter().collect();

        let take_out = take_run(&run_array, &take_indices).unwrap();

        assert_eq!(take_out.len(), 7);
        // adjacent identical values are merged: [2,2,2,2,2,1,1] -> 2 runs
        assert_eq!(
            take_out.run_ends().values().len(),
            2,
            "expected two physical runs"
        );
        assert_eq!(take_out.run_ends().values(), &[5_i32, 7]);

        let take_out_values = take_out.values().as_primitive::<Int32Type>();
        assert_eq!(take_out_values.values(), &[2, 1]);
    }

    #[test]
    fn test_take_runs_null_indices() {
        // A null index must not become logical index 0, and null indices must merge with
        // consecutive runs whose values are already null.
        let mut builder = PrimitiveRunBuilder::<Int32Type, Int32Type>::new();
        builder.extend([Some(10), Some(10), None, None, Some(99)]);
        let run_array = builder.finish();

        let indices = Int32Array::from(vec![Some(0), None, Some(2), Some(3), Some(4)]);
        let taken = take(&run_array, &indices, None).unwrap();
        let run = taken.as_run::<Int32Type>();
        let logical: Vec<Option<i32>> = run.downcast::<Int32Array>().unwrap().into_iter().collect();
        assert_eq!(logical, vec![Some(10), None, None, None, Some(99)]);
        assert_eq!(run.run_ends().values(), &[1_i32, 4, 5]);
    }

    #[test]
    fn test_take_runs_sliced() {
        let logical_array: Vec<i32> = vec![1, 1, 2, 2, 3, 3, 3, 4, 4, 5, 5, 6, 6];

        let mut builder = PrimitiveRunBuilder::<Int32Type, Int32Type>::new();
        builder.extend(logical_array.into_iter().map(Some));
        let run_array = builder.finish();

        let run_array = run_array.slice(4, 6); // [3, 3, 3, 4, 4, 5]

        let take_indices: PrimitiveArray<Int32Type> = vec![0, 5, 5, 1, 4].into_iter().collect();

        let result = take_run(&run_array, &take_indices).unwrap();
        let result = result.downcast::<Int32Array>().unwrap();

        // [3, 5, 5, 3, 4] -> 4 physical runs (no adjacent duplicates to merge)
        assert_eq!(
            result.run_ends().values().len(),
            4,
            "expected four physical runs"
        );
        assert_eq!(result.run_ends().values(), &[1_i32, 3, 4, 5]);

        let expected = vec![3, 5, 5, 3, 4];
        let actual = result.into_iter().flatten().collect::<Vec<_>>();

        assert_eq!(expected, actual);
    }

    #[test]
    fn test_take_value_index_from_fixed_list() {
        let list = FixedSizeListArray::from_iter_primitive::<Int32Type, _, _>(
            vec![
                Some(vec![Some(1), Some(2), None]),
                Some(vec![Some(4), None, Some(6)]),
                None,
                Some(vec![None, Some(8), Some(9)]),
            ],
            3,
        );

        let indices = UInt32Array::from(vec![2, 1, 0]);
        let indexed = take_value_indices_from_fixed_size_list(&list, &indices, 3).unwrap();

        assert_eq!(indexed, UInt32Array::from(vec![6, 7, 8, 3, 4, 5, 0, 1, 2]));

        let indices = UInt32Array::from(vec![3, 2, 1, 2, 0]);
        let indexed = take_value_indices_from_fixed_size_list(&list, &indices, 3).unwrap();

        assert_eq!(
            indexed,
            UInt32Array::from(vec![9, 10, 11, 6, 7, 8, 3, 4, 5, 6, 7, 8, 0, 1, 2])
        );
    }

    #[test]
    fn test_take_null_indices() {
        // Build indices with values that are out of bounds, but masked by null mask
        let indices = Int32Array::new(
            vec![1, 2, 400, 400].into(),
            Some(NullBuffer::from(vec![true, true, false, false])),
        );
        let values = Int32Array::from(vec![1, 23, 4, 5]);
        let r = take(&values, &indices, None).unwrap();
        let values = r
            .as_primitive::<Int32Type>()
            .into_iter()
            .collect::<Vec<_>>();
        assert_eq!(&values, &[Some(23), Some(4), None, None])
    }

    #[test]
    fn test_take_fixed_size_list_null_indices() {
        let indices = Int32Array::from_iter([Some(0), None]);
        let values = Arc::new(Int32Array::from(vec![0, 1, 2, 3]));
        let arr_field = Arc::new(Field::new_list_field(values.data_type().clone(), true));
        let values = FixedSizeListArray::try_new(arr_field, 2, values, None).unwrap();

        let r = take(&values, &indices, None).unwrap();
        let values = r
            .as_fixed_size_list()
            .values()
            .as_primitive::<Int32Type>()
            .into_iter()
            .collect::<Vec<_>>();
        assert_eq!(values, &[Some(0), Some(1), None, None])
    }

    #[test]
    fn test_take_bytes_null_indices() {
        let indices = Int32Array::new(
            vec![0, 1, 400, 400].into(),
            Some(NullBuffer::from_iter(vec![true, true, false, false])),
        );
        let values = StringArray::from(vec![Some("foo"), None]);
        let r = take(&values, &indices, None).unwrap();
        let values = r.as_string::<i32>().iter().collect::<Vec<_>>();
        assert_eq!(&values, &[Some("foo"), None, None, None])
    }

    #[test]
    fn test_take_union_sparse() {
        let structs = create_test_struct(vec![
            Some((Some(true), Some(42))),
            Some((Some(false), Some(28))),
            Some((Some(false), Some(19))),
            Some((Some(true), Some(31))),
            None,
        ]);
        let strings = StringArray::from(vec![Some("a"), None, Some("c"), None, Some("d")]);
        let type_ids = [1; 5].into_iter().collect::<ScalarBuffer<i8>>();

        let union_fields = [
            (
                0,
                Arc::new(Field::new("f1", structs.data_type().clone(), true)),
            ),
            (
                1,
                Arc::new(Field::new("f2", strings.data_type().clone(), true)),
            ),
        ]
        .into_iter()
        .collect();
        let children = vec![Arc::new(structs) as Arc<dyn Array>, Arc::new(strings)];
        let array = UnionArray::try_new(union_fields, type_ids, None, children).unwrap();

        let indices = vec![0, 3, 1, 0, 2, 4];
        let index = UInt32Array::from(indices.clone());
        let actual = take(&array, &index, None).unwrap();
        let actual = actual.as_any().downcast_ref::<UnionArray>().unwrap();
        let strings = actual.child(1);
        let strings = strings.as_any().downcast_ref::<StringArray>().unwrap();

        let actual = strings.iter().collect::<Vec<_>>();
        let expected = vec![Some("a"), None, None, Some("a"), Some("c"), Some("d")];
        assert_eq!(expected, actual);
    }

    #[test]
    fn test_take_union_dense() {
        let type_ids = vec![0, 1, 1, 0, 0, 1, 0];
        let offsets = vec![0, 0, 1, 1, 2, 2, 3];
        let ints = vec![10, 20, 30, 40];
        let strings = vec![Some("a"), None, Some("c"), Some("d")];

        let indices = vec![0, 3, 1, 0, 2, 4];

        let taken_type_ids = vec![0, 0, 1, 0, 1, 0];
        let taken_offsets = vec![0, 1, 0, 2, 1, 3];
        let taken_ints = vec![10, 20, 10, 30];
        let taken_strings = vec![Some("a"), None];

        let type_ids = <ScalarBuffer<i8>>::from(type_ids);
        let offsets = <ScalarBuffer<i32>>::from(offsets);
        let ints = UInt32Array::from(ints);
        let strings = StringArray::from(strings);

        let union_fields = [
            (
                0,
                Arc::new(Field::new("f1", ints.data_type().clone(), true)),
            ),
            (
                1,
                Arc::new(Field::new("f2", strings.data_type().clone(), true)),
            ),
        ]
        .into_iter()
        .collect();

        let array = UnionArray::try_new(
            union_fields,
            type_ids,
            Some(offsets),
            vec![Arc::new(ints), Arc::new(strings)],
        )
        .unwrap();

        let index = UInt32Array::from(indices);

        let actual = take(&array, &index, None).unwrap();
        let actual = actual.as_any().downcast_ref::<UnionArray>().unwrap();

        assert_eq!(actual.offsets(), Some(&ScalarBuffer::from(taken_offsets)));
        assert_eq!(actual.type_ids(), &ScalarBuffer::from(taken_type_ids));
        assert_eq!(
            UInt32Array::from(actual.child(0).to_data()),
            UInt32Array::from(taken_ints)
        );
        assert_eq!(
            StringArray::from(actual.child(1).to_data()),
            StringArray::from(taken_strings)
        );
    }

    fn union_i32_logical(array: &UnionArray) -> Vec<Option<i32>> {
        (0..array.len())
            .map(|i| {
                let child = array.child(array.type_id(i)).as_primitive::<Int32Type>();
                let offset = array.value_offset(i);
                if child.is_null(offset) {
                    None
                } else {
                    Some(child.value(offset))
                }
            })
            .collect()
    }

    #[test]
    fn test_take_union_dense_null_indices() {
        // Dense [1, 2, 3]; a null index must not become child offset 0. Use a non-zero
        // type id to verify null indices don't use the invalid default type id 0.
        let fields =
            UnionFields::try_new(vec![5], vec![Field::new("i", DataType::Int32, true)]).unwrap();
        let dense = UnionArray::try_new(
            fields.clone(),
            ScalarBuffer::from(vec![5_i8, 5, 5]),
            Some(ScalarBuffer::from(vec![0_i32, 1, 2])),
            vec![Arc::new(Int32Array::from(vec![1, 2, 3]))],
        )
        .unwrap();
        let sparse = UnionArray::try_new(
            fields,
            ScalarBuffer::from(vec![5_i8, 5, 5]),
            None,
            vec![Arc::new(Int32Array::from(vec![1, 2, 3]))],
        )
        .unwrap();

        // Use an out-of-bounds backing value for the null index to exercise `take_native`'s
        // default type id path. A union need not have a child with type id 0.
        let indices = UInt32Array::new(
            ScalarBuffer::from(vec![0_u32, 99, 2]),
            Some(NullBuffer::from(vec![true, false, true])),
        );
        let dense_taken = take(&dense, &indices, None).unwrap();
        let sparse_taken = take(&sparse, &indices, None).unwrap();
        let dense_logical = union_i32_logical(dense_taken.as_any().downcast_ref().unwrap());
        let sparse_logical = union_i32_logical(sparse_taken.as_any().downcast_ref().unwrap());

        assert_eq!(dense_logical, vec![Some(1), None, Some(3)]);
        assert_eq!(dense_logical, sparse_logical);
    }

    #[test]
    fn test_take_empty_union_without_null_indices() {
        let fields = UnionFields::try_new(vec![], Vec::<Field>::new()).unwrap();
        let indices = UInt32Array::from(Vec::<u32>::new());

        let sparse = UnionArray::try_new(
            fields.clone(),
            ScalarBuffer::<i8>::from(vec![]),
            None,
            vec![],
        )
        .unwrap();
        let dense = UnionArray::try_new(
            fields,
            ScalarBuffer::<i8>::from(vec![]),
            Some(ScalarBuffer::<i32>::from(vec![])),
            vec![],
        )
        .unwrap();

        for values in [&sparse, &dense] {
            let taken = take(values, &indices, None).unwrap();
            assert_eq!(taken.len(), 0);
            assert_eq!(taken.data_type(), values.data_type());
        }
    }

    #[test]
    fn test_take_empty_union_with_null_indices() {
        let fields = UnionFields::try_new(vec![], Vec::<Field>::new()).unwrap();
        let indices = UInt32Array::from(vec![None]);

        let sparse = UnionArray::try_new(
            fields.clone(),
            ScalarBuffer::<i8>::from(vec![]),
            None,
            vec![],
        )
        .unwrap();
        let dense = UnionArray::try_new(
            fields,
            ScalarBuffer::<i8>::from(vec![]),
            Some(ScalarBuffer::<i32>::from(vec![])),
            vec![],
        )
        .unwrap();

        for values in [&sparse, &dense] {
            let error = take(values, &indices, None).unwrap_err();
            assert_eq!(
                error.to_string(),
                "Compute error: Cannot take from a union with zero fields when indices contains nulls"
            );
        }
    }

    #[test]
    fn test_take_union_dense_using_builder() {
        let mut builder = UnionBuilder::new_dense();

        builder.append::<Int32Type>("a", 1).unwrap();
        builder.append::<Float64Type>("b", 3.0).unwrap();
        builder.append::<Int32Type>("a", 4).unwrap();
        builder.append::<Int32Type>("a", 5).unwrap();
        builder.append::<Float64Type>("b", 2.0).unwrap();

        let union = builder.build().unwrap();

        let indices = UInt32Array::from(vec![2, 0, 1, 2]);

        let mut builder = UnionBuilder::new_dense();

        builder.append::<Int32Type>("a", 4).unwrap();
        builder.append::<Int32Type>("a", 1).unwrap();
        builder.append::<Float64Type>("b", 3.0).unwrap();
        builder.append::<Int32Type>("a", 4).unwrap();

        let taken = builder.build().unwrap();

        assert_eq!(
            taken.to_data(),
            take(&union, &indices, None).unwrap().to_data()
        );
    }

    #[test]
    fn test_take_union_dense_all_match_issue_6206() {
        let fields = UnionFields::from_fields(vec![Field::new("a", DataType::Int64, false)]);
        let ints = Arc::new(Int64Array::from(vec![1, 2, 3, 4, 5]));

        let array = UnionArray::try_new(
            fields,
            ScalarBuffer::from(vec![0_i8, 0, 0, 0, 0]),
            Some(ScalarBuffer::from_iter(0_i32..5)),
            vec![ints],
        )
        .unwrap();

        let indices = Int64Array::from(vec![0, 2, 4]);
        let array = take(&array, &indices, None).unwrap();
        assert_eq!(array.len(), 3);
    }

    /// Fixture for the offset-overflow tests: a single large value plus the
    /// number of times it must be selected so the cumulative offset exceeds
    /// `i32::MAX`. Using a large value keeps the index count (and the test
    /// runtime) small.
    fn offset_overflow_fixture() -> (StringArray, usize) {
        let value_len = 1_000_000;
        let values = StringArray::from(vec![Some("a".repeat(value_len))]);
        let n = i32::MAX as usize / value_len + 1;
        (values, n)
    }

    #[test]
    fn test_take_bytes_offset_overflow() {
        let (values, n) = offset_overflow_fixture();
        let indices = Int32Array::from(vec![0; n]);
        assert!(matches!(
            take(&values, &indices, None),
            Err(ArrowError::OffsetOverflowError(_))
        ));
    }

    /// The offset-overflow error must also be produced on the nullable code
    /// path (when the output contains nulls), not only on the no-null fast path.
    #[test]
    fn test_take_bytes_offset_overflow_nullable() {
        let (values, n) = offset_overflow_fixture();
        // A null index forces the output to contain nulls, exercising the
        // nullable code path.
        let validity =
            NullBuffer::from_iter(std::iter::once(false).chain(std::iter::repeat_n(true, n)));
        let indices = Int32Array::new(vec![0i32; n + 1].into(), Some(validity));

        assert!(matches!(
            take(&values, &indices, None),
            Err(ArrowError::OffsetOverflowError(_))
        ));
    }

    #[test]
    fn test_take_run_empty_indices() {
        let mut builder = PrimitiveRunBuilder::<Int32Type, Int32Type>::new();
        builder.extend([Some(1), Some(1), Some(2), Some(2)]);
        let run_array = builder.finish();

        let logical_indices: PrimitiveArray<Int32Type> = PrimitiveArray::from(Vec::<i32>::new());

        let result = take_impl::<_, true>(&run_array, &logical_indices)
            .expect("take_run with empty indices");

        // Verify the result is a valid empty RunArray
        assert_eq!(result.len(), 0);
        assert_eq!(result.null_count(), 0);

        // Verify that the result can be downcast and used without validation errors
        // This specifically tests that "The values in run_ends array should be strictly positive" is not triggered
        let run_result = result
            .as_any()
            .downcast_ref::<RunArray<Int32Type>>()
            .expect("result should be a RunArray");
        assert_eq!(run_result.run_ends().len(), 0);
        assert_eq!(run_result.values().len(), 0);
    }

    #[test]
    fn test_take_run_end_encoded_merges_identical_runs() {
        // https://github.com/apache/arrow-rs/issues/7710
        // Indices [0,1,4,5] select from [1,1,0,0,1,1] — the 0s are skipped,
        // so the output should be a single run of 1s, not two.
        let mut builder = PrimitiveRunBuilder::<Int32Type, Int32Type>::new();
        builder.extend([1, 1, 0, 0, 1, 1].into_iter().map(Some));
        let ree = builder.finish();

        let indexes = Int32Array::from_iter_values(vec![0, 1, 4, 5]);
        let result = take(&ree, &indexes, None).unwrap();
        let result = result
            .as_run::<Int32Type>()
            .downcast::<Int32Array>()
            .unwrap();

        // Verify physical layout: all four logical values collapse into one run.
        assert_eq!(
            result.run_ends().values().len(),
            1,
            "expected a single physical run"
        );
        assert_eq!(result.run_ends().values(), &[4_i32]);

        let actual = result.into_iter().flatten().collect::<Vec<_>>();
        assert_eq!(actual, vec![1, 1, 1, 1]);
    }

    #[test]
    fn test_take_run_end_encoded_merges_identical_string_runs() {
        let mut builder = StringRunBuilder::<Int32Type>::new();
        builder.extend(
            ["bob", "bob", "alice", "alice", "bob", "bob"]
                .into_iter()
                .map(Some),
        );
        let ree = builder.finish();

        let indexes = Int32Array::from_iter_values(vec![0, 1, 4, 5]);
        let result = take(&ree, &indexes, None).unwrap();
        let result = result
            .as_run::<Int32Type>()
            .downcast::<StringArray>()
            .unwrap();

        // Verify physical layout: all four logical values collapse into one run.
        assert_eq!(
            result.run_ends().values().len(),
            1,
            "expected a single physical run"
        );
        assert_eq!(result.run_ends().values(), &[4_i32]);

        let actual = result.into_iter().flatten().collect::<Vec<_>>();
        assert_eq!(actual, vec!["bob", "bob", "bob", "bob"]);
    }

    #[test]
    fn test_take_run_end_encoded_mixed_runs() {
        // Validates that runs are merged whether the same logical value comes
        // from the same physical index (repeated indices) or distinct physical indices.
        let mut builder = StringRunBuilder::<Int32Type>::new();
        builder.extend(
            ["bob", "bob", "alice", "alice", "bob", "bob", "eve", "eve"]
                .into_iter()
                .map(Some),
        );
        let ree = builder.finish();

        // [bob,bob,bob,bob,bob,alice,alice,alice,eve,eve,eve]
        let indexes = Int32Array::from_iter_values(vec![0, 0, 1, 4, 5, 2, 3, 2, 6, 7, 6]);
        let result = take(&ree, &indexes, None).unwrap();
        let result = result
            .as_run::<Int32Type>()
            .downcast::<StringArray>()
            .unwrap();

        // Verify physical layout: 11 logical values across exactly 3 physical runs.

        println!("run_ends_raw: {:?}", result.run_ends());
        println!("run_ends: {:?}", result.run_ends().values());
        println!("values : {:?}", result.values());
        assert_eq!(
            result.run_ends().values().len(),
            3,
            "expected three physical runs"
        );
        assert_eq!(result.run_ends().values(), &[5_i32, 8, 11]);

        let actual = result.into_iter().flatten().collect::<Vec<_>>();
        assert_eq!(
            actual,
            vec![
                "bob", "bob", "bob", "bob", "bob", "alice", "alice", "alice", "eve", "eve", "eve"
            ]
        );
    }

    // parent null rows on FixedSizeList must propagate to child elements.
    #[test]
    fn test_take_fixed_size_list_parent_nulls() {
        let list = FixedSizeListArray::from_iter_primitive::<Int32Type, _, _>(
            vec![
                Some(vec![Some(1), Some(2)]),
                None,
                Some(vec![Some(5), Some(6)]),
            ],
            2,
        );

        let indices = UInt32Array::from(vec![2, 1, 0]);
        let result = take(&list, &indices, None).unwrap();
        let result = result.as_fixed_size_list();

        assert_eq!(result.len(), 3);
        assert!(result.is_valid(0));
        assert!(result.is_null(1));
        assert!(result.is_valid(2));

        let child = result.values().as_primitive::<Int32Type>();
        assert_eq!(child.value(0), 5);
        assert_eq!(child.value(1), 6);
        assert!(child.is_null(2));
        assert!(child.is_null(3));
        assert_eq!(child.value(4), 1);
        assert_eq!(child.value(5), 2);
    }

    #[test]
    fn test_take_zero_sized_fixed_size_list() {
        let input = FixedSizeListArray::try_new_with_length(
            Field::new_list_field(DataType::Int32, true).into(),
            0,
            Arc::new(Int32Array::new_null(0)),
            None,
            3,
        )
        .unwrap();

        let indices = UInt32Array::from(vec![2, 0]);
        let result = take(&input, &indices, None).unwrap();

        assert_eq!(result.len(), 2);
    }
}