arrow_array/array/

boolean_array.rs

// 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,
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// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

use crate::array::print_long_array;
use crate::builder::{BooleanBufferBuilder, BooleanBuilder};
use crate::iterator::BooleanIter;
use crate::{Array, ArrayAccessor, ArrayRef, Scalar};
use arrow_buffer::{BooleanBuffer, Buffer, MutableBuffer, NullBuffer, bit_util};
use arrow_data::{ArrayData, ArrayDataBuilder};
use arrow_schema::DataType;
use std::any::Any;
use std::sync::Arc;

/// An array of [boolean values](https://arrow.apache.org/docs/format/Columnar.html#fixed-size-primitive-layout)
///
/// # Example: From a Vec
///
/// ```
/// # use arrow_array::{Array, BooleanArray};
/// let arr: BooleanArray = vec![true, true, false].into();
/// ```
///
/// # Example: From an optional Vec
///
/// ```
/// # use arrow_array::{Array, BooleanArray};
/// let arr: BooleanArray = vec![Some(true), None, Some(false)].into();
/// ```
///
/// # Example: From an iterator
///
/// ```
/// # use arrow_array::{Array, BooleanArray};
/// let arr: BooleanArray = (0..5).map(|x| (x % 2 == 0).then(|| x % 3 == 0)).collect();
/// let values: Vec<_> = arr.iter().collect();
/// assert_eq!(&values, &[Some(true), None, Some(false), None, Some(false)])
/// ```
///
/// # Example: Using Builder
///
/// ```
/// # use arrow_array::Array;
/// # use arrow_array::builder::BooleanBuilder;
/// let mut builder = BooleanBuilder::new();
/// builder.append_value(true);
/// builder.append_null();
/// builder.append_value(false);
/// let array = builder.finish();
/// let values: Vec<_> = array.iter().collect();
/// assert_eq!(&values, &[Some(true), None, Some(false)])
/// ```
///
#[derive(Clone)]
pub struct BooleanArray {
    values: BooleanBuffer,
    nulls: Option<NullBuffer>,
}

impl std::fmt::Debug for BooleanArray {
    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
        write!(f, "BooleanArray\n[\n")?;
        print_long_array(self, f, |array, index, f| {
            std::fmt::Debug::fmt(&array.value(index), f)
        })?;
        write!(f, "]")
    }
}

impl BooleanArray {
    /// Create a new [`BooleanArray`] from the provided values and nulls
    ///
    /// # Panics
    ///
    /// Panics if `values.len() != nulls.len()`
    pub fn new(values: BooleanBuffer, nulls: Option<NullBuffer>) -> Self {
        if let Some(n) = nulls.as_ref() {
            assert_eq!(values.len(), n.len());
        }
        Self { values, nulls }
    }

    /// Create a new [`BooleanArray`] from the provided values and nulls without validation.
    ///
    /// # Safety
    /// - `values.len() == nulls.len()` if `nulls` is `Some`
    pub unsafe fn new_unchecked(values: BooleanBuffer, nulls: Option<NullBuffer>) -> Self {
        if cfg!(feature = "force_validate") {
            return Self::new(values, nulls);
        }
        Self { values, nulls }
    }

    /// Create a new [`BooleanArray`] with length `len` consisting only of nulls
    pub fn new_null(len: usize) -> Self {
        Self {
            values: BooleanBuffer::new_unset(len),
            nulls: Some(NullBuffer::new_null(len)),
        }
    }

    /// Create a new [`Scalar`] from `value`
    pub fn new_scalar(value: bool) -> Scalar<Self> {
        let values = match value {
            true => BooleanBuffer::new_set(1),
            false => BooleanBuffer::new_unset(1),
        };
        Scalar::new(Self::new(values, None))
    }

    /// Create a new [`BooleanArray`] from a [`Buffer`] specified by `offset` and `len`, the `offset` and `len` in bits
    /// Logically convert each bit in [`Buffer`] to boolean and use it to build [`BooleanArray`].
    /// using this method will make the following points self-evident:
    /// * there is no `null` in the constructed [`BooleanArray`];
    /// * without considering `buffer.into()`, this method is efficient because there is no need to perform pack and unpack operations on boolean;
    pub fn new_from_packed(buffer: impl Into<Buffer>, offset: usize, len: usize) -> Self {
        BooleanBuffer::new(buffer.into(), offset, len).into()
    }

    /// Create a new [`BooleanArray`] from `&[u8]`
    /// This method uses `new_from_packed` and constructs a [`Buffer`] using `value`, and offset is set to 0 and len is set to `value.len() * 8`
    /// using this method will make the following points self-evident:
    /// * there is no `null` in the constructed [`BooleanArray`];
    /// * the length of the constructed [`BooleanArray`] is always a multiple of 8;
    pub fn new_from_u8(value: &[u8]) -> Self {
        BooleanBuffer::new(Buffer::from(value), 0, value.len() * 8).into()
    }

    /// Returns the length of this array.
    pub fn len(&self) -> usize {
        self.values.len()
    }

    /// Returns whether this array is empty.
    pub fn is_empty(&self) -> bool {
        self.values.is_empty()
    }

    /// Returns a zero-copy slice of this array with the indicated offset and length.
    pub fn slice(&self, offset: usize, length: usize) -> Self {
        Self {
            values: self.values.slice(offset, length),
            nulls: self.nulls.as_ref().map(|n| n.slice(offset, length)),
        }
    }

    /// Returns a new boolean array builder
    pub fn builder(capacity: usize) -> BooleanBuilder {
        BooleanBuilder::with_capacity(capacity)
    }

    /// Returns the underlying [`BooleanBuffer`] holding all the values of this array
    pub fn values(&self) -> &BooleanBuffer {
        &self.values
    }

    /// Returns the number of non null, true values within this array.
    /// If you only need to check if there is at least one true value, consider using `has_true()` which can short-circuit and be more efficient.
    pub fn true_count(&self) -> usize {
        match self.nulls() {
            Some(nulls) => {
                let null_chunks = nulls.inner().bit_chunks().iter_padded();
                let value_chunks = self.values().bit_chunks().iter_padded();
                null_chunks
                    .zip(value_chunks)
                    .map(|(a, b)| (a & b).count_ones() as usize)
                    .sum()
            }
            None => self.values().count_set_bits(),
        }
    }

    /// Returns the number of non null, false values within this array.
    /// If you only need to check if there is at least one false value, consider using `has_false()` which can short-circuit and be more efficient.
    pub fn false_count(&self) -> usize {
        self.len() - self.null_count() - self.true_count()
    }

    /// Returns whether there is at least one non-null `true` value in this array.
    ///
    /// This is more efficient than `true_count() > 0` because it can short-circuit
    /// as soon as a `true` value is found, without counting all set bits.
    ///
    /// Null values are not counted as `true`. Returns `false` for empty arrays.
    pub fn has_true(&self) -> bool {
        match self.nulls() {
            Some(nulls) => {
                let null_chunks = nulls.inner().bit_chunks().iter_padded();
                let value_chunks = self.values().bit_chunks().iter_padded();
                null_chunks.zip(value_chunks).any(|(n, v)| (n & v) != 0)
            }
            None => self.values().has_true(),
        }
    }

    /// Returns whether there is at least one non-null `false` value in this array.
    ///
    /// This is more efficient than `false_count() > 0` because it can short-circuit
    /// as soon as a `false` value is found, without counting all set bits.
    ///
    /// Null values are not counted as `false`. Returns `false` for empty arrays.
    pub fn has_false(&self) -> bool {
        match self.nulls() {
            Some(nulls) => {
                let null_chunks = nulls.inner().bit_chunks().iter_padded();
                let value_chunks = self.values().bit_chunks().iter_padded();
                null_chunks.zip(value_chunks).any(|(n, v)| (n & !v) != 0)
            }
            None => self.values().has_false(),
        }
    }

    /// Returns the boolean value at index `i`.
    ///
    /// Note: This method does not check for nulls and the value is arbitrary
    /// if [`is_null`](Self::is_null) returns true for the index.
    ///
    /// # Safety
    /// This doesn't check bounds, the caller must ensure that index < self.len()
    pub unsafe fn value_unchecked(&self, i: usize) -> bool {
        unsafe { self.values.value_unchecked(i) }
    }

    /// Returns the boolean value at index `i`.
    ///
    /// Note: This method does not check for nulls and the value is arbitrary
    /// if [`is_null`](Self::is_null) returns true for the index.
    ///
    /// # Panics
    /// Panics if index `i` is out of bounds
    pub fn value(&self, i: usize) -> bool {
        assert!(
            i < self.len(),
            "Trying to access an element at index {} from a BooleanArray of length {}",
            i,
            self.len()
        );
        // Safety:
        // `i < self.len()
        unsafe { self.value_unchecked(i) }
    }

    /// Returns an iterator that returns the values of `array.value(i)` for an iterator with each element `i`
    pub fn take_iter<'a>(
        &'a self,
        indexes: impl Iterator<Item = Option<usize>> + 'a,
    ) -> impl Iterator<Item = Option<bool>> + 'a {
        indexes.map(|opt_index| opt_index.map(|index| self.value(index)))
    }

    /// Returns an iterator that returns the values of `array.value(i)` for an iterator with each element `i`
    /// # Safety
    ///
    /// caller must ensure that the offsets in the iterator are less than the array len()
    pub unsafe fn take_iter_unchecked<'a>(
        &'a self,
        indexes: impl Iterator<Item = Option<usize>> + 'a,
    ) -> impl Iterator<Item = Option<bool>> + 'a {
        indexes.map(|opt_index| opt_index.map(|index| unsafe { self.value_unchecked(index) }))
    }

    /// Create a [`BooleanArray`] by evaluating the operation for
    /// each element of the provided array
    ///
    /// ```
    /// # use arrow_array::{BooleanArray, Int32Array};
    ///
    /// let array = Int32Array::from(vec![1, 2, 3, 4, 5]);
    /// let r = BooleanArray::from_unary(&array, |x| x > 2);
    /// assert_eq!(&r, &BooleanArray::from(vec![false, false, true, true, true]));
    /// ```
    pub fn from_unary<T: ArrayAccessor, F>(left: T, mut op: F) -> Self
    where
        F: FnMut(T::Item) -> bool,
    {
        let nulls = left.logical_nulls();
        let values = BooleanBuffer::collect_bool(left.len(), |i| unsafe {
            // SAFETY: i in range 0..len
            op(left.value_unchecked(i))
        });
        Self::new(values, nulls)
    }

    /// Create a [`BooleanArray`] by evaluating the binary operation for
    /// each element of the provided arrays
    ///
    /// ```
    /// # use arrow_array::{BooleanArray, Int32Array};
    ///
    /// let a = Int32Array::from(vec![1, 2, 3, 4, 5]);
    /// let b = Int32Array::from(vec![1, 2, 0, 2, 5]);
    /// let r = BooleanArray::from_binary(&a, &b, |a, b| a == b);
    /// assert_eq!(&r, &BooleanArray::from(vec![true, true, false, false, true]));
    /// ```
    ///
    /// # Panics
    ///
    /// This function panics if left and right are not the same length
    ///
    pub fn from_binary<T: ArrayAccessor, S: ArrayAccessor, F>(left: T, right: S, mut op: F) -> Self
    where
        F: FnMut(T::Item, S::Item) -> bool,
    {
        assert_eq!(left.len(), right.len());

        let nulls = NullBuffer::union(
            left.logical_nulls().as_ref(),
            right.logical_nulls().as_ref(),
        );
        let values = BooleanBuffer::collect_bool(left.len(), |i| unsafe {
            // SAFETY: i in range 0..len
            op(left.value_unchecked(i), right.value_unchecked(i))
        });
        Self::new(values, nulls)
    }

    /// Apply a bitwise operation to this array's values using u64 operations,
    /// returning a new [`BooleanArray`].
    ///
    /// The null buffer is preserved unchanged.
    ///
    /// See [`BooleanBuffer::from_bitwise_unary_op`] for details on the operation.
    ///
    /// # Example
    ///
    /// ```
    /// # use arrow_array::BooleanArray;
    /// let array = BooleanArray::from(vec![true, false, true]);
    /// let result = array.bitwise_unary(|x| !x);
    /// assert_eq!(result, BooleanArray::from(vec![false, true, false]));
    /// ```
    pub fn bitwise_unary<F>(&self, op: F) -> BooleanArray
    where
        F: FnMut(u64) -> u64,
    {
        let values = BooleanBuffer::from_bitwise_unary_op(
            self.values.values(),
            self.values.offset(),
            self.values.len(),
            op,
        );
        BooleanArray::new(values, self.nulls.clone())
    }

    /// Try to apply a bitwise operation to this array's values in place using
    /// u64 operations.
    ///
    /// If the underlying buffer is uniquely owned, the operation is applied
    /// in place and `Ok` is returned. If the buffer is shared, `Err(self)` is
    /// returned so the caller can fall back to [`bitwise_unary`](Self::bitwise_unary).
    ///
    /// The null buffer is preserved unchanged.
    ///
    /// # Example
    ///
    /// ```
    /// # use arrow_array::BooleanArray;
    /// let array = BooleanArray::from(vec![true, false, true]);
    /// let result = array.bitwise_unary_mut(|x| !x).unwrap();
    /// assert_eq!(result, BooleanArray::from(vec![false, true, false]));
    /// ```
    pub fn bitwise_unary_mut<F>(self, op: F) -> Result<BooleanArray, BooleanArray>
    where
        F: FnMut(u64) -> u64,
    {
        self.try_bitwise_unary_in_place(op)
            .map_err(|(array, _op)| array)
    }

    /// Apply a bitwise operation to this array's values in place if the buffer
    /// is uniquely owned, or clone and apply if shared.
    ///
    /// This is a convenience wrapper around [`bitwise_unary_mut`](Self::bitwise_unary_mut)
    /// that falls back to [`bitwise_unary`](Self::bitwise_unary) when the buffer is shared.
    ///
    /// The null buffer is preserved unchanged.
    ///
    /// # Example
    ///
    /// ```
    /// # use arrow_array::BooleanArray;
    /// let array = BooleanArray::from(vec![true, false, true]);
    /// let result = array.bitwise_unary_mut_or_clone(|x| !x);
    /// assert_eq!(result, BooleanArray::from(vec![false, true, false]));
    /// ```
    pub fn bitwise_unary_mut_or_clone<F>(self, op: F) -> BooleanArray
    where
        F: FnMut(u64) -> u64,
    {
        match self.try_bitwise_unary_in_place(op) {
            Ok(array) => array,
            Err((array, op)) => array.bitwise_unary(op),
        }
    }

    /// Try to apply a unary op in place. Returns `op` back on failure so
    /// callers can fall back to an allocating path without requiring `F: Clone`.
    fn try_bitwise_unary_in_place<F>(self, op: F) -> Result<BooleanArray, (BooleanArray, F)>
    where
        F: FnMut(u64) -> u64,
    {
        let (values, nulls) = self.into_parts();
        let offset = values.offset();
        let len = values.len();
        let buffer = values.into_inner();
        match buffer.into_mutable() {
            Ok(mut buf) => {
                bit_util::apply_bitwise_unary_op(buf.as_slice_mut(), offset, len, op);
                let values = BooleanBuffer::new(buf.into(), offset, len);
                Ok(BooleanArray::new(values, nulls))
            }
            Err(buffer) => {
                let values = BooleanBuffer::new(buffer, offset, len);
                Err((BooleanArray::new(values, nulls), op))
            }
        }
    }

    /// Apply a bitwise binary operation to this array and `rhs` using u64
    /// operations, returning a new [`BooleanArray`].
    ///
    /// Null buffers are unioned: the result is null where either input is null.
    ///
    /// See [`BooleanBuffer::from_bitwise_binary_op`] for details on the operation.
    ///
    /// # Panics
    ///
    /// Panics if `self` and `rhs` have different lengths.
    ///
    /// # Example
    ///
    /// ```
    /// # use arrow_array::BooleanArray;
    /// let a = BooleanArray::from(vec![true, false, true, true]);
    /// let b = BooleanArray::from(vec![true, true, false, true]);
    /// let result = a.bitwise_bin_op(&b, |a, b| a & b);
    /// assert_eq!(result, BooleanArray::from(vec![true, false, false, true]));
    /// ```
    pub fn bitwise_bin_op<F>(&self, rhs: &BooleanArray, op: F) -> BooleanArray
    where
        F: FnMut(u64, u64) -> u64,
    {
        assert_eq!(self.len(), rhs.len());
        let nulls = NullBuffer::union(self.nulls(), rhs.nulls());
        let values = BooleanBuffer::from_bitwise_binary_op(
            self.values.values(),
            self.values.offset(),
            rhs.values.values(),
            rhs.values.offset(),
            self.values.len(),
            op,
        );
        BooleanArray::new(values, nulls)
    }

    /// Try to apply a bitwise binary operation to this array and `rhs` in
    /// place using u64 operations.
    ///
    /// If this array's underlying buffer is uniquely owned, the operation is
    /// applied in place and `Ok` is returned. If the buffer is shared,
    /// `Err(self)` is returned so the caller can fall back to
    /// [`bitwise_bin_op`](Self::bitwise_bin_op).
    ///
    /// Null buffers are unioned: the result is null where either input is null.
    ///
    /// # Panics
    ///
    /// Panics if `self` and `rhs` have different lengths.
    ///
    /// # Example
    ///
    /// ```
    /// # use arrow_array::BooleanArray;
    /// let a = BooleanArray::from(vec![true, false, true, true]);
    /// let b = BooleanArray::from(vec![true, true, false, true]);
    /// let result = a.bitwise_bin_op_mut(&b, |a, b| a & b).unwrap();
    /// assert_eq!(result, BooleanArray::from(vec![true, false, false, true]));
    /// ```
    pub fn bitwise_bin_op_mut<F>(
        self,
        rhs: &BooleanArray,
        op: F,
    ) -> Result<BooleanArray, BooleanArray>
    where
        F: FnMut(u64, u64) -> u64,
    {
        self.try_bitwise_bin_op_in_place(rhs, op)
            .map_err(|(array, _op)| array)
    }

    /// Apply a bitwise binary operation to this array and `rhs` in place if the
    /// buffer is uniquely owned, or clone and apply if shared.
    ///
    /// This is a convenience wrapper around [`bitwise_bin_op_mut`](Self::bitwise_bin_op_mut)
    /// that falls back to [`bitwise_bin_op`](Self::bitwise_bin_op) when the buffer is shared.
    ///
    /// Null buffers are unioned: the result is null where either input is null.
    ///
    /// # Panics
    ///
    /// Panics if `self` and `rhs` have different lengths.
    ///
    /// # Example
    ///
    /// ```
    /// # use arrow_array::BooleanArray;
    /// let a = BooleanArray::from(vec![true, false, true, true]);
    /// let b = BooleanArray::from(vec![true, true, false, true]);
    /// let result = a.bitwise_bin_op_mut_or_clone(&b, |a, b| a & b);
    /// assert_eq!(result, BooleanArray::from(vec![true, false, false, true]));
    /// ```
    pub fn bitwise_bin_op_mut_or_clone<F>(self, rhs: &BooleanArray, op: F) -> BooleanArray
    where
        F: FnMut(u64, u64) -> u64,
    {
        match self.try_bitwise_bin_op_in_place(rhs, op) {
            Ok(array) => array,
            Err((array, op)) => array.bitwise_bin_op(rhs, op),
        }
    }

    /// Try to apply a binary op in place. Returns `op` back on failure so
    /// callers can fall back to an allocating path without requiring `F: Clone`.
    fn try_bitwise_bin_op_in_place<F>(
        self,
        rhs: &BooleanArray,
        op: F,
    ) -> Result<BooleanArray, (BooleanArray, F)>
    where
        F: FnMut(u64, u64) -> u64,
    {
        assert_eq!(self.len(), rhs.len());
        let (values, nulls) = self.into_parts();
        let offset = values.offset();
        let len = values.len();
        let buffer = values.into_inner();
        match buffer.into_mutable() {
            Ok(mut buf) => {
                bit_util::apply_bitwise_binary_op(
                    buf.as_slice_mut(),
                    offset,
                    rhs.values.inner(),
                    rhs.values.offset(),
                    len,
                    op,
                );
                // Defer null union to the success path so the Err path returns
                // self's original nulls, avoiding a redundant union in callers
                // that fall back to bitwise_bin_op.
                let nulls = NullBuffer::union(nulls.as_ref(), rhs.nulls());
                let values = BooleanBuffer::new(buf.into(), offset, len);
                Ok(BooleanArray::new(values, nulls))
            }
            Err(buffer) => {
                let values = BooleanBuffer::new(buffer, offset, len);
                Err((BooleanArray::new(values, nulls), op))
            }
        }
    }

    /// Returns a new [`BooleanArray`] of the same length where only the first
    /// `n` non-null `true` positions remain `true`; any `true` positions
    /// beyond the first `n` are replaced with `false`. The null buffer is
    /// preserved unchanged.
    ///
    /// If this array has at most `n` non-null `true` values, `self` is
    /// returned unchanged.
    ///
    /// # Example
    ///
    /// ```
    /// # use arrow_array::BooleanArray;
    /// let a = BooleanArray::from(vec![true, false, true, true, false, true]);
    /// // Keep only the first 2 `true` positions; later trues become false.
    /// let r = a.take_n_true(2);
    /// assert_eq!(r, BooleanArray::from(vec![true, false, true, false, false, false]));
    /// ```
    pub fn take_n_true(self, n: usize) -> BooleanArray {
        let len = self.len();
        // `set_indices` scans 64 bits at a time via `trailing_zeros`, so locating
        // the first set bit beyond the retained prefix is cheaper than visiting
        // every bit. When a null buffer is present, skip set bits whose
        // corresponding entry is null so only non-null trues count toward `n`
        // (matching `true_count` semantics).
        let mut iter = self.values.set_indices();
        let end = match self.nulls.as_ref() {
            Some(nulls) => iter.filter(|&i| nulls.is_valid(i)).nth(n),
            None => iter.nth(n),
        };
        let Some(end) = end else {
            return self;
        };

        let mut builder = BooleanBufferBuilder::new(len);
        builder.append_buffer(&self.values.slice(0, end));
        builder.append_n(len - end, false);
        BooleanArray::new(builder.finish(), self.nulls)
    }

    /// Deconstruct this array into its constituent parts
    pub fn into_parts(self) -> (BooleanBuffer, Option<NullBuffer>) {
        (self.values, self.nulls)
    }
}

/// SAFETY: Correctly implements the contract of Arrow Arrays
unsafe impl Array for BooleanArray {
    fn as_any(&self) -> &dyn Any {
        self
    }

    fn to_data(&self) -> ArrayData {
        self.clone().into()
    }

    fn into_data(self) -> ArrayData {
        self.into()
    }

    fn data_type(&self) -> &DataType {
        &DataType::Boolean
    }

    fn slice(&self, offset: usize, length: usize) -> ArrayRef {
        Arc::new(self.slice(offset, length))
    }

    fn len(&self) -> usize {
        self.values.len()
    }

    fn is_empty(&self) -> bool {
        self.values.is_empty()
    }

    fn shrink_to_fit(&mut self) {
        self.values.shrink_to_fit();
        if let Some(nulls) = &mut self.nulls {
            nulls.shrink_to_fit();
        }
    }

    fn offset(&self) -> usize {
        self.values.offset()
    }

    fn nulls(&self) -> Option<&NullBuffer> {
        self.nulls.as_ref()
    }

    fn logical_null_count(&self) -> usize {
        self.null_count()
    }

    fn get_buffer_memory_size(&self) -> usize {
        let mut sum = self.values.inner().capacity();
        if let Some(x) = &self.nulls {
            sum += x.buffer().capacity()
        }
        sum
    }

    fn get_array_memory_size(&self) -> usize {
        std::mem::size_of::<Self>() + self.get_buffer_memory_size()
    }

    #[cfg(feature = "pool")]
    fn claim(&self, pool: &dyn arrow_buffer::MemoryPool) {
        self.values.claim(pool);
        if let Some(nulls) = &self.nulls {
            nulls.claim(pool);
        }
    }
}

impl ArrayAccessor for &BooleanArray {
    type Item = bool;

    fn value(&self, index: usize) -> Self::Item {
        BooleanArray::value(self, index)
    }

    unsafe fn value_unchecked(&self, index: usize) -> Self::Item {
        unsafe { BooleanArray::value_unchecked(self, index) }
    }
}

impl From<Vec<bool>> for BooleanArray {
    fn from(data: Vec<bool>) -> Self {
        let mut mut_buf = MutableBuffer::new_null(data.len());
        {
            let mut_slice = mut_buf.as_slice_mut();
            for (i, b) in data.iter().enumerate() {
                if *b {
                    bit_util::set_bit(mut_slice, i);
                }
            }
        }
        let array_data = ArrayData::builder(DataType::Boolean)
            .len(data.len())
            .add_buffer(mut_buf.into());

        let array_data = unsafe { array_data.build_unchecked() };
        BooleanArray::from(array_data)
    }
}

impl From<Vec<Option<bool>>> for BooleanArray {
    fn from(data: Vec<Option<bool>>) -> Self {
        data.iter().collect()
    }
}

impl From<ArrayData> for BooleanArray {
    fn from(data: ArrayData) -> Self {
        let (data_type, len, nulls, offset, mut buffers, _child_data) = data.into_parts();
        assert_eq!(
            data_type,
            DataType::Boolean,
            "BooleanArray expected ArrayData with type Boolean got {data_type:?}",
        );
        assert_eq!(
            buffers.len(),
            1,
            "BooleanArray data should contain a single buffer only (values buffer)"
        );
        let buffer = buffers.pop().expect("checked above");
        let values = BooleanBuffer::new(buffer, offset, len);

        Self { values, nulls }
    }
}

impl From<BooleanArray> for ArrayData {
    fn from(array: BooleanArray) -> Self {
        let builder = ArrayDataBuilder::new(DataType::Boolean)
            .len(array.values.len())
            .offset(array.values.offset())
            .nulls(array.nulls)
            .buffers(vec![array.values.into_inner()]);

        unsafe { builder.build_unchecked() }
    }
}

impl<'a> IntoIterator for &'a BooleanArray {
    type Item = Option<bool>;
    type IntoIter = BooleanIter<'a>;

    fn into_iter(self) -> Self::IntoIter {
        BooleanIter::<'a>::new(self)
    }
}

impl<'a> BooleanArray {
    /// constructs a new iterator
    pub fn iter(&'a self) -> BooleanIter<'a> {
        BooleanIter::<'a>::new(self)
    }
}

/// An optional boolean value
///
/// This struct is used as an adapter when creating `BooleanArray` from an iterator.
/// `FromIterator` for `BooleanArray` takes an iterator where the elements can be `into`
/// this struct. So once implementing `From` or `Into` trait for a type, an iterator of
/// the type can be collected to `BooleanArray`.
///
/// See also [NativeAdapter](crate::array::NativeAdapter).
#[derive(Debug)]
struct BooleanAdapter {
    /// Corresponding Rust native type if available
    pub native: Option<bool>,
}

impl From<bool> for BooleanAdapter {
    fn from(value: bool) -> Self {
        BooleanAdapter {
            native: Some(value),
        }
    }
}

impl From<&bool> for BooleanAdapter {
    fn from(value: &bool) -> Self {
        BooleanAdapter {
            native: Some(*value),
        }
    }
}

impl From<Option<bool>> for BooleanAdapter {
    fn from(value: Option<bool>) -> Self {
        BooleanAdapter { native: value }
    }
}

impl From<&Option<bool>> for BooleanAdapter {
    fn from(value: &Option<bool>) -> Self {
        BooleanAdapter { native: *value }
    }
}

impl<Ptr: Into<BooleanAdapter>> FromIterator<Ptr> for BooleanArray {
    fn from_iter<I: IntoIterator<Item = Ptr>>(iter: I) -> Self {
        let iter = iter.into_iter();
        let capacity = match iter.size_hint() {
            (lower, Some(upper)) if lower == upper => lower,
            _ => 0,
        };
        let mut builder = BooleanBuilder::with_capacity(capacity);
        builder.extend(iter.map(|item| item.into().native));
        builder.finish()
    }
}

impl BooleanArray {
    /// Creates a [`BooleanArray`] from an iterator of trusted length.
    ///
    /// # Safety
    ///
    /// The iterator must be [`TrustedLen`](https://doc.rust-lang.org/std/iter/trait.TrustedLen.html).
    /// I.e. that `size_hint().1` correctly reports its length. Note that this is a stronger
    /// guarantee that `ExactSizeIterator` provides which could still report a wrong length.
    ///
    /// # Panics
    ///
    /// Panics if the iterator does not report an upper bound on `size_hint()`.
    #[inline]
    #[allow(
        private_bounds,
        reason = "We will expose BooleanAdapter if there is a need"
    )]
    pub unsafe fn from_trusted_len_iter<I, P>(iter: I) -> Self
    where
        P: Into<BooleanAdapter>,
        I: ExactSizeIterator<Item = P>,
    {
        let data_len = iter.len();

        let num_bytes = bit_util::ceil(data_len, 8);
        let mut null_builder = MutableBuffer::from_len_zeroed(num_bytes);
        let mut val_builder = MutableBuffer::from_len_zeroed(num_bytes);

        let data = val_builder.as_slice_mut();

        let null_slice = null_builder.as_slice_mut();
        iter.enumerate().for_each(|(i, item)| {
            if let Some(a) = item.into().native {
                unsafe {
                    // SAFETY: There will be enough space in the buffers due to the trusted len size
                    // hint
                    bit_util::set_bit_raw(null_slice.as_mut_ptr(), i);
                    if a {
                        bit_util::set_bit_raw(data.as_mut_ptr(), i);
                    }
                }
            }
        });

        let values = BooleanBuffer::new(val_builder.into(), 0, data_len);
        let nulls = NullBuffer::from_unsliced_buffer(null_builder, data_len);
        BooleanArray::new(values, nulls)
    }
}

impl From<BooleanBuffer> for BooleanArray {
    fn from(values: BooleanBuffer) -> Self {
        Self {
            values,
            nulls: None,
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    // Captures the values-buffer identity for a BooleanArray so tests can assert
    // whether an operation reused the original allocation or produced a new one.
    struct PointerInfo {
        ptr: *const u8,
        offset: usize,
        len: usize,
    }

    impl PointerInfo {
        // Record the current values buffer pointer plus bit offset/length. The
        // offset/length checks ensure a logically equivalent slice wasn't rebuilt
        // with a different view over the same allocation.
        fn new(array: &BooleanArray) -> Self {
            Self {
                ptr: array.values().inner().as_ptr(),
                offset: array.values().offset(),
                len: array.values().len(),
            }
        }

        // Assert that the array still points at the exact same values buffer and
        // preserves the same bit view.
        fn assert_same(&self, array: &BooleanArray) {
            assert_eq!(array.values().inner().as_ptr(), self.ptr);
            assert_eq!(array.values().offset(), self.offset);
            assert_eq!(array.values().len(), self.len);
        }

        // Assert that the array now points at a different values allocation,
        // indicating the operation fell back to an allocating path.
        fn assert_different(&self, array: &BooleanArray) {
            assert_ne!(array.values().inner().as_ptr(), self.ptr);
        }
    }
    use arrow_buffer::Buffer;
    use rand::{Rng, rng};

    #[test]
    fn test_boolean_fmt_debug() {
        let arr = BooleanArray::from(vec![true, false, false]);
        assert_eq!(
            "BooleanArray\n[\n  true,\n  false,\n  false,\n]",
            format!("{arr:?}")
        );
    }

    #[test]
    fn test_boolean_with_null_fmt_debug() {
        let mut builder = BooleanArray::builder(3);
        builder.append_value(true);
        builder.append_null();
        builder.append_value(false);
        let arr = builder.finish();
        assert_eq!(
            "BooleanArray\n[\n  true,\n  null,\n  false,\n]",
            format!("{arr:?}")
        );
    }

    #[test]
    fn test_boolean_array_from_vec() {
        let buf = Buffer::from([10_u8]);
        let arr = BooleanArray::from(vec![false, true, false, true]);
        assert_eq!(&buf, arr.values().inner());
        assert_eq!(4, arr.len());
        assert_eq!(0, arr.offset());
        assert_eq!(0, arr.null_count());
        for i in 0..4 {
            assert!(!arr.is_null(i));
            assert!(arr.is_valid(i));
            assert_eq!(i == 1 || i == 3, arr.value(i), "failed at {i}")
        }
    }

    #[test]
    fn test_boolean_array_from_vec_option() {
        let buf = Buffer::from([10_u8]);
        let arr = BooleanArray::from(vec![Some(false), Some(true), None, Some(true)]);
        assert_eq!(&buf, arr.values().inner());
        assert_eq!(4, arr.len());
        assert_eq!(0, arr.offset());
        assert_eq!(1, arr.null_count());
        for i in 0..4 {
            if i == 2 {
                assert!(arr.is_null(i));
                assert!(!arr.is_valid(i));
            } else {
                assert!(!arr.is_null(i));
                assert!(arr.is_valid(i));
                assert_eq!(i == 1 || i == 3, arr.value(i), "failed at {i}")
            }
        }
    }

    #[test]
    fn test_boolean_array_from_packed() {
        let v = [1_u8, 2_u8, 3_u8];
        let arr = BooleanArray::new_from_packed(v, 0, 24);
        assert_eq!(24, arr.len());
        assert_eq!(0, arr.offset());
        assert_eq!(0, arr.null_count());
        assert!(arr.nulls.is_none());
        for i in 0..24 {
            assert!(!arr.is_null(i));
            assert!(arr.is_valid(i));
            assert_eq!(
                i == 0 || i == 9 || i == 16 || i == 17,
                arr.value(i),
                "failed t {i}"
            )
        }
    }

    #[test]
    fn test_boolean_array_from_slice_u8() {
        let v: Vec<u8> = vec![1, 2, 3];
        let slice = &v[..];
        let arr = BooleanArray::new_from_u8(slice);
        assert_eq!(24, arr.len());
        assert_eq!(0, arr.offset());
        assert_eq!(0, arr.null_count());
        assert!(arr.nulls().is_none());
        for i in 0..24 {
            assert!(!arr.is_null(i));
            assert!(arr.is_valid(i));
            assert_eq!(
                i == 0 || i == 9 || i == 16 || i == 17,
                arr.value(i),
                "failed t {i}"
            )
        }
    }

    #[test]
    fn test_boolean_array_from_iter() {
        let v = vec![Some(false), Some(true), Some(false), Some(true)];
        let arr = v.into_iter().collect::<BooleanArray>();
        assert_eq!(4, arr.len());
        assert_eq!(0, arr.offset());
        assert_eq!(0, arr.null_count());
        assert!(arr.nulls().is_none());
        for i in 0..3 {
            assert!(!arr.is_null(i));
            assert!(arr.is_valid(i));
            assert_eq!(i == 1 || i == 3, arr.value(i), "failed at {i}")
        }
    }

    #[test]
    fn test_boolean_array_from_non_nullable_iter() {
        let v = vec![true, false, true];
        let arr = v.into_iter().collect::<BooleanArray>();
        assert_eq!(3, arr.len());
        assert_eq!(0, arr.offset());
        assert_eq!(0, arr.null_count());
        assert!(arr.nulls().is_none());

        assert!(arr.value(0));
        assert!(!arr.value(1));
        assert!(arr.value(2));
    }

    #[test]
    fn test_boolean_array_from_nullable_iter() {
        let v = vec![Some(true), None, Some(false), None];
        let arr = v.into_iter().collect::<BooleanArray>();
        assert_eq!(4, arr.len());
        assert_eq!(0, arr.offset());
        assert_eq!(2, arr.null_count());
        assert!(arr.nulls().is_some());

        assert!(arr.is_valid(0));
        assert!(arr.is_null(1));
        assert!(arr.is_valid(2));
        assert!(arr.is_null(3));

        assert!(arr.value(0));
        assert!(!arr.value(2));
    }

    #[test]
    fn test_boolean_array_from_nullable_trusted_len_iter() {
        // Should exhibit the same behavior as `from_iter`, which is tested above.
        let v = vec![Some(true), None, Some(false), None];
        let expected = v.clone().into_iter().collect::<BooleanArray>();
        let actual = unsafe {
            // SAFETY: `v` has trusted length
            BooleanArray::from_trusted_len_iter(v.into_iter())
        };
        assert_eq!(expected, actual);
    }

    #[test]
    fn test_boolean_array_from_iter_with_larger_upper_bound() {
        // See https://github.com/apache/arrow-rs/issues/8505
        // This returns an upper size hint of 4
        let iterator = vec![Some(true), None, Some(false), None]
            .into_iter()
            .filter(Option::is_some);
        let arr = iterator.collect::<BooleanArray>();
        assert_eq!(2, arr.len());
    }

    #[test]
    fn test_boolean_array_builder() {
        // Test building a boolean array with ArrayData builder and offset
        // 000011011
        let buf = Buffer::from([27_u8]);
        let buf2 = buf.clone();
        let data = ArrayData::builder(DataType::Boolean)
            .len(5)
            .offset(2)
            .add_buffer(buf)
            .build()
            .unwrap();
        let arr = BooleanArray::from(data);
        assert_eq!(&buf2, arr.values().inner());
        assert_eq!(5, arr.len());
        assert_eq!(2, arr.offset());
        assert_eq!(0, arr.null_count());
        for i in 0..3 {
            assert_eq!(i != 0, arr.value(i), "failed at {i}");
        }
    }

    #[test]
    #[should_panic(
        expected = "Trying to access an element at index 4 from a BooleanArray of length 3"
    )]
    fn test_fixed_size_binary_array_get_value_index_out_of_bound() {
        let v = vec![Some(true), None, Some(false)];
        let array = v.into_iter().collect::<BooleanArray>();

        array.value(4);
    }

    #[test]
    #[should_panic(expected = "BooleanArray data should contain a single buffer only \
                               (values buffer)")]
    // Different error messages, so skip for now
    // https://github.com/apache/arrow-rs/issues/1545
    #[cfg(not(feature = "force_validate"))]
    fn test_boolean_array_invalid_buffer_len() {
        let data = unsafe {
            ArrayData::builder(DataType::Boolean)
                .len(5)
                .build_unchecked()
        };
        drop(BooleanArray::from(data));
    }

    #[test]
    #[should_panic(expected = "BooleanArray expected ArrayData with type Boolean got Int32")]
    fn test_from_array_data_validation() {
        let _ = BooleanArray::from(ArrayData::new_empty(&DataType::Int32));
    }

    #[test]
    #[cfg_attr(miri, ignore)] // Takes too long
    fn test_true_false_count() {
        let mut rng = rng();

        for _ in 0..10 {
            // No nulls
            let d: Vec<_> = (0..2000).map(|_| rng.random_bool(0.5)).collect();
            let b = BooleanArray::from(d.clone());

            let expected_true = d.iter().filter(|x| **x).count();
            assert_eq!(b.true_count(), expected_true);
            assert_eq!(b.false_count(), d.len() - expected_true);

            // With nulls
            let d: Vec<_> = (0..2000)
                .map(|_| rng.random_bool(0.5).then(|| rng.random_bool(0.5)))
                .collect();
            let b = BooleanArray::from(d.clone());

            let expected_true = d.iter().filter(|x| matches!(x, Some(true))).count();
            assert_eq!(b.true_count(), expected_true);

            let expected_false = d.iter().filter(|x| matches!(x, Some(false))).count();
            assert_eq!(b.false_count(), expected_false);
        }
    }

    #[test]
    fn test_into_parts() {
        let boolean_array = [Some(true), None, Some(false)]
            .into_iter()
            .collect::<BooleanArray>();
        let (values, nulls) = boolean_array.into_parts();
        assert_eq!(values.values(), &[0b0000_0001]);
        assert!(nulls.is_some());
        assert_eq!(nulls.unwrap().buffer().as_slice(), &[0b0000_0101]);

        let boolean_array =
            BooleanArray::from(vec![false, false, false, false, false, false, false, true]);
        let (values, nulls) = boolean_array.into_parts();
        assert_eq!(values.values(), &[0b1000_0000]);
        assert!(nulls.is_none());
    }

    #[test]
    fn test_new_null_array() {
        let arr = BooleanArray::new_null(5);

        assert_eq!(arr.len(), 5);
        assert_eq!(arr.null_count(), 5);
        assert_eq!(arr.true_count(), 0);
        assert_eq!(arr.false_count(), 0);

        for i in 0..5 {
            assert!(arr.is_null(i));
            assert!(!arr.is_valid(i));
        }
    }

    #[test]
    fn test_slice_with_nulls() {
        let arr = BooleanArray::from(vec![Some(true), None, Some(false)]);
        let sliced = arr.slice(1, 2);

        assert_eq!(sliced.len(), 2);
        assert_eq!(sliced.null_count(), 1);

        assert!(sliced.is_null(0));
        assert!(sliced.is_valid(1));
        assert!(!sliced.value(1));
    }

    #[test]
    fn test_has_true_has_false_all_true() {
        let arr = BooleanArray::from(vec![true, true, true]);
        assert!(arr.has_true());
        assert!(!arr.has_false());
    }

    #[test]
    fn test_has_true_has_false_all_false() {
        let arr = BooleanArray::from(vec![false, false, false]);
        assert!(!arr.has_true());
        assert!(arr.has_false());
    }

    #[test]
    fn test_has_true_has_false_mixed() {
        let arr = BooleanArray::from(vec![true, false, true]);
        assert!(arr.has_true());
        assert!(arr.has_false());
    }

    #[test]
    fn test_has_true_has_false_empty() {
        let arr = BooleanArray::from(Vec::<bool>::new());
        assert!(!arr.has_true());
        assert!(!arr.has_false());
    }

    #[test]
    fn test_has_true_has_false_nulls_all_valid_true() {
        let arr = BooleanArray::from(vec![Some(true), None, Some(true)]);
        assert!(arr.has_true());
        assert!(!arr.has_false());
    }

    #[test]
    fn test_has_true_has_false_nulls_all_valid_false() {
        let arr = BooleanArray::from(vec![Some(false), None, Some(false)]);
        assert!(!arr.has_true());
        assert!(arr.has_false());
    }

    #[test]
    fn test_has_true_has_false_all_null() {
        let arr = BooleanArray::new_null(5);
        assert!(!arr.has_true());
        assert!(!arr.has_false());
    }

    #[test]
    fn test_has_false_aligned_suffix_all_true() {
        let arr = BooleanArray::from(vec![true; 129]);
        assert!(arr.has_true());
        assert!(!arr.has_false());
    }

    #[test]
    fn test_has_false_non_aligned_all_true() {
        // 65 elements: exercises the remainder path in has_false
        let arr = BooleanArray::from(vec![true; 65]);
        assert!(arr.has_true());
        assert!(!arr.has_false());
    }

    #[test]
    fn test_has_false_non_aligned_last_false() {
        // 64 trues + 1 false: remainder path should find the false
        let mut values = vec![true; 64];
        values.push(false);
        let arr = BooleanArray::from(values);
        assert!(arr.has_true());
        assert!(arr.has_false());
    }

    #[test]
    fn test_has_false_exact_64_all_true() {
        // Exactly 64 elements, no remainder
        let arr = BooleanArray::from(vec![true; 64]);
        assert!(arr.has_true());
        assert!(!arr.has_false());
    }

    #[test]
    fn test_has_true_has_false_unaligned_slices() {
        let cases = [
            (1, 129, true, false),
            (3, 130, true, false),
            (5, 65, true, false),
            (7, 64, true, false),
        ];

        let base = BooleanArray::from(vec![true; 300]);

        for (offset, len, expected_has_true, expected_has_false) in cases {
            let arr = base.slice(offset, len);
            assert_eq!(
                arr.has_true(),
                expected_has_true,
                "offset={offset} len={len}"
            );
            assert_eq!(
                arr.has_false(),
                expected_has_false,
                "offset={offset} len={len}"
            );
        }
    }

    #[test]
    fn test_has_true_has_false_exact_multiples_of_64() {
        let cases = [
            (64, true, false),
            (128, true, false),
            (192, true, false),
            (256, true, false),
        ];

        for (len, expected_has_true, expected_has_false) in cases {
            let arr = BooleanArray::from(vec![true; len]);
            assert_eq!(arr.has_true(), expected_has_true, "len={len}");
            assert_eq!(arr.has_false(), expected_has_false, "len={len}");
        }
    }

    #[test]
    fn test_bitwise_unary_not() {
        let arr = BooleanArray::from(vec![true, false, true, false]);
        let result = arr.bitwise_unary(|x| !x);
        let expected = BooleanArray::from(vec![false, true, false, true]);
        assert_eq!(result, expected);
    }

    #[test]
    fn test_bitwise_unary_preserves_nulls() {
        let arr = BooleanArray::from(vec![Some(true), None, Some(false), Some(true)]);
        let result = arr.bitwise_unary(|x| !x);

        assert_eq!(result.null_count(), 1);
        assert!(result.is_null(1));
        assert!(!result.value(0));
        assert!(result.value(2));
        assert!(!result.value(3));
    }

    #[test]
    fn test_bitwise_unary_mut_unshared() {
        let arr = BooleanArray::from(vec![true, false, true, false]);
        let info = PointerInfo::new(&arr);
        let result = arr.bitwise_unary_mut(|x| !x).unwrap();
        let expected = BooleanArray::from(vec![false, true, false, true]);
        assert_eq!(result, expected);
        info.assert_same(&result);
    }

    #[test]
    fn test_bitwise_unary_mut_shared() {
        let arr = BooleanArray::from(vec![true, false, true, false]);
        let info = PointerInfo::new(&arr);
        let _shared = arr.clone();
        let result = arr.bitwise_unary_mut(|x| !x);
        assert!(result.is_err());

        let returned = result.unwrap_err();
        assert_eq!(returned, BooleanArray::from(vec![true, false, true, false]));
        info.assert_same(&returned);
    }

    #[test]
    fn test_bitwise_unary_mut_with_nulls() {
        let arr = BooleanArray::from(vec![Some(true), None, Some(false)]);
        let result = arr.bitwise_unary_mut(|x| !x).unwrap();

        assert_eq!(result.null_count(), 1);
        assert!(result.is_null(1));
        assert!(!result.value(0));
        assert!(result.value(2));
    }

    #[test]
    fn test_bitwise_unary_mut_or_clone_shared() {
        let arr = BooleanArray::from(vec![true, false, true]);
        let info = PointerInfo::new(&arr);
        let _shared = arr.clone();
        let result = arr.bitwise_unary_mut_or_clone(|x| !x);
        assert_eq!(result, BooleanArray::from(vec![false, true, false]));
        info.assert_different(&result);
    }

    #[test]
    fn test_bitwise_unary_mut_or_clone_unshared() {
        // Covers the uniquely-owned fast path in bitwise_unary_mut_or_clone.
        let arr = BooleanArray::from(vec![true, false, true]);
        let info = PointerInfo::new(&arr);
        let result = arr.bitwise_unary_mut_or_clone(|x| !x);
        assert_eq!(result, BooleanArray::from(vec![false, true, false]));
        info.assert_same(&result);
    }

    #[test]
    fn test_bitwise_bin_op_and() {
        let a = BooleanArray::from(vec![true, false, true, true]);
        let b = BooleanArray::from(vec![true, true, false, true]);
        let result = a.bitwise_bin_op(&b, |a, b| a & b);
        assert_eq!(result, BooleanArray::from(vec![true, false, false, true]));
    }

    #[test]
    fn test_bitwise_bin_op_or() {
        let a = BooleanArray::from(vec![true, false, true, false]);
        let b = BooleanArray::from(vec![false, true, false, false]);
        let result = a.bitwise_bin_op(&b, |a, b| a | b);
        assert_eq!(result, BooleanArray::from(vec![true, true, true, false]));
    }

    #[test]
    fn test_bitwise_bin_op_null_union() {
        let a = BooleanArray::from(vec![Some(true), None, Some(true), Some(false)]);
        let b = BooleanArray::from(vec![Some(true), Some(true), None, Some(true)]);
        let result = a.bitwise_bin_op(&b, |a, b| a & b);

        assert_eq!(result.null_count(), 2);
        assert!(result.is_null(1));
        assert!(result.is_null(2));
        assert!(result.value(0));
        assert!(!result.value(3));
    }

    #[test]
    fn test_bitwise_bin_op_one_nullable() {
        let a = BooleanArray::from(vec![Some(true), None, Some(true)]);
        let b = BooleanArray::from(vec![false, true, true]);
        let result = a.bitwise_bin_op(&b, |a, b| a & b);

        assert_eq!(result.null_count(), 1);
        assert!(result.is_null(1));
        assert!(!result.value(0));
        assert!(result.value(2));
    }

    #[test]
    fn test_bitwise_bin_op_no_nulls() {
        let a = BooleanArray::from(vec![true, false, true]);
        let b = BooleanArray::from(vec![false, true, true]);
        let result = a.bitwise_bin_op(&b, |a, b| a | b);

        assert!(result.nulls().is_none());
        assert_eq!(result, BooleanArray::from(vec![true, true, true]));
    }

    #[test]
    fn test_bitwise_bin_op_mut_unshared() {
        let a = BooleanArray::from(vec![true, false, true, true]);
        let info = PointerInfo::new(&a);
        let b = BooleanArray::from(vec![true, true, false, true]);
        let result = a.bitwise_bin_op_mut(&b, |a, b| a & b).unwrap();
        assert_eq!(result, BooleanArray::from(vec![true, false, false, true]));
        info.assert_same(&result);
    }

    #[test]
    fn test_bitwise_bin_op_mut_shared() {
        let a = BooleanArray::from(vec![true, false, true, true]);
        let info = PointerInfo::new(&a);
        let _shared = a.clone();
        let result = a.bitwise_bin_op_mut(
            &BooleanArray::from(vec![true, true, false, true]),
            |a, b| a & b,
        );
        assert!(result.is_err());
        let returned = result.unwrap_err();
        info.assert_same(&returned);
    }

    #[test]
    fn test_bitwise_bin_op_mut_with_nulls() {
        let a = BooleanArray::from(vec![Some(true), None, Some(true), Some(false)]);
        let b = BooleanArray::from(vec![Some(true), Some(true), None, Some(true)]);
        let result = a.bitwise_bin_op_mut(&b, |a, b| a & b).unwrap();

        assert_eq!(result.null_count(), 2);
        assert!(result.is_null(1));
        assert!(result.is_null(2));
        assert!(result.value(0));
        assert!(!result.value(3));
    }

    #[test]
    fn test_bitwise_bin_op_mut_or_clone_shared() {
        let a = BooleanArray::from(vec![true, false, true, true]);
        let info = PointerInfo::new(&a);
        let _shared = a.clone();
        let b = BooleanArray::from(vec![true, true, false, true]);
        let result = a.bitwise_bin_op_mut_or_clone(&b, |a, b| a & b);
        assert_eq!(result, BooleanArray::from(vec![true, false, false, true]));
        info.assert_different(&result);
    }

    #[test]
    fn test_bitwise_bin_op_mut_or_clone_shared_with_nulls() {
        // When the buffer is shared, _mut_or_clone falls back to bitwise_bin_op.
        // The null union must only be applied once, not double-applied.
        let a = BooleanArray::from(vec![Some(true), None, Some(true), Some(false)]);
        let info = PointerInfo::new(&a);
        let _shared = a.clone();
        let b = BooleanArray::from(vec![Some(true), Some(true), None, Some(true)]);

        let expected = a.bitwise_bin_op(&b, |a, b| a & b);
        let result = a.bitwise_bin_op_mut_or_clone(&b, |a, b| a & b);

        assert_eq!(result, expected);
        assert_eq!(result.null_count(), 2);
        assert!(result.is_null(1));
        assert!(result.is_null(2));
        info.assert_different(&result);
    }

    #[test]
    fn test_bitwise_bin_op_mut_or_clone_unshared_with_nulls() {
        // Covers the uniquely-owned fast path in bitwise_bin_op_mut_or_clone,
        // including null union on the in-place path.
        let a = BooleanArray::from(vec![Some(true), None, Some(true), Some(false)]);
        let info = PointerInfo::new(&a);
        let b = BooleanArray::from(vec![Some(true), Some(true), None, Some(true)]);
        let result = a.bitwise_bin_op_mut_or_clone(&b, |a, b| a & b);

        assert_eq!(result.null_count(), 2);
        assert!(result.is_null(1));
        assert!(result.is_null(2));
        assert!(result.value(0));
        assert!(!result.value(3));
        info.assert_same(&result);
    }

    #[test]
    fn test_bitwise_unary_empty() {
        let arr = BooleanArray::from(Vec::<bool>::new());
        let result = arr.bitwise_unary(|x| !x);
        assert_eq!(result.len(), 0);
    }

    #[test]
    fn test_bitwise_bin_op_empty() {
        let a = BooleanArray::from(Vec::<bool>::new());
        let b = BooleanArray::from(Vec::<bool>::new());
        let result = a.bitwise_bin_op(&b, |a, b| a & b);
        assert_eq!(result.len(), 0);
    }

    #[test]
    fn test_bitwise_unary_sliced() {
        // Slicing creates a non-zero offset into the underlying buffer.
        let arr = BooleanArray::from(vec![true, false, true, true, false]);
        let sliced = arr.slice(1, 3); // [false, true, true]

        let result = sliced.bitwise_unary(|x| !x);
        assert_eq!(result.len(), 3);
        assert!(result.value(0));
        assert!(!result.value(1));
        assert!(!result.value(2));
    }

    #[test]
    fn test_bitwise_unary_mut_sliced() {
        // Slicing shares the buffer, so _mut must return Err.
        let arr = BooleanArray::from(vec![true, false, true, true, false]);
        let sliced = arr.slice(1, 3);
        assert!(sliced.bitwise_unary_mut(|x| !x).is_err());
    }

    #[test]
    fn test_bitwise_unary_mut_or_clone_sliced() {
        // Slicing shares the buffer, so _mut_or_clone falls back to allocating.
        let arr = BooleanArray::from(vec![true, false, true, true, false]);
        let sliced = arr.slice(1, 3); // [false, true, true]

        let result = sliced.bitwise_unary_mut_or_clone(|x| !x);
        assert_eq!(result.len(), 3);
        assert!(result.value(0));
        assert!(!result.value(1));
        assert!(!result.value(2));
    }

    #[test]
    fn test_bitwise_bin_op_different_offsets() {
        // Left and right sliced to different offsets exercises misaligned
        // bit handling in from_bitwise_binary_op.
        let left_full = BooleanArray::from(vec![false, true, false, true, true]);
        let right_full = BooleanArray::from(vec![true, true, true, false, true, false]);

        let left = left_full.slice(1, 3); // [true, false, true]
        let right = right_full.slice(2, 3); // [true, false, true]

        let result = left.bitwise_bin_op(&right, |a, b| a & b);
        assert_eq!(result.len(), 3);
        assert!(result.value(0));
        assert!(!result.value(1));
        assert!(result.value(2));
    }

    #[test]
    fn test_bitwise_bin_op_mut_or_clone_different_offsets() {
        // Both sliced (shared buffers), so falls back to allocating path.
        let left_full = BooleanArray::from(vec![false, true, true, false, true]);
        let right_full = BooleanArray::from(vec![true, true, false, false, true, false]);

        let left = left_full.slice(1, 3); // [true, true, false]
        let right = right_full.slice(2, 3); // [false, false, true]

        let expected = left.bitwise_bin_op(&right, |a, b| a & b);
        let result = left.bitwise_bin_op_mut_or_clone(&right, |a, b| a & b);
        assert_eq!(result, expected);
    }

    #[test]
    fn test_take_n_true_keeps_first_n_matches() {
        let a = BooleanArray::from(vec![true, false, true, true, false, true, true]);
        // true positions: 0, 2, 3, 5, 6
        let r = a.clone().take_n_true(3);
        assert_eq!(r.len(), a.len());
        assert_eq!(r.true_count(), 3);
        let out: Vec<bool> = (0..r.len()).map(|i| r.value(i)).collect();
        assert_eq!(
            out,
            vec![true, false, true, true, false, false, false],
            "first three trues should survive, the rest become false"
        );
    }

    #[test]
    fn test_take_n_true_passes_through_when_already_small_enough() {
        let a = BooleanArray::from(vec![true, false, true, false]);
        let r = a.clone().take_n_true(5);
        assert_eq!(r.len(), a.len());
        assert_eq!(r.true_count(), 2);
        assert_eq!(r, a);
    }

    #[test]
    fn test_take_n_true_zero_returns_all_false() {
        let a = BooleanArray::from(vec![true, true, true]);
        let r = a.take_n_true(0);
        assert_eq!(r.len(), 3);
        assert_eq!(r.true_count(), 0);
    }

    #[test]
    fn test_take_n_true_preserves_nulls_and_skips_them() {
        // Non-null trues: positions 0, 3, 5. Null at 2 must not count toward `n`.
        let a = BooleanArray::from(vec![
            Some(true),
            Some(false),
            None,
            Some(true),
            Some(false),
            Some(true),
        ]);
        assert_eq!(a.true_count(), 3);
        let len = a.len();

        let r = a.take_n_true(2);
        assert_eq!(r.len(), len);
        assert_eq!(r.true_count(), 2);
        // Null buffer is preserved unchanged.
        assert_eq!(r.null_count(), 1);
        assert!(r.is_null(2));
        // First two non-null trues kept; the third (position 5) becomes false.
        assert!(r.value(0));
        assert!(!r.value(1));
        assert!(r.value(3));
        assert!(!r.value(4));
        assert!(!r.value(5));
    }

    #[test]
    fn test_take_n_true_empty_array() {
        let a = BooleanArray::from(Vec::<bool>::new());
        let r = a.take_n_true(5);
        assert_eq!(r.len(), 0);
        assert_eq!(r.true_count(), 0);
    }
}