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use crate::utils::CustomIterTools;
use arrow::array::{
Array, ArrayData, ArrayRef, BooleanArray, BooleanBufferBuilder, LargeListArray,
LargeStringArray, PrimitiveArray,
};
use arrow::buffer::MutableBuffer;
use arrow::datatypes::{ArrowNumericType, ArrowPrimitiveType, DataType, Field};
use num::Num;
pub trait GetValues {
fn get_values<T>(&self) -> &[T::Native]
where
T: ArrowPrimitiveType,
T::Native: Num;
}
impl GetValues for ArrayData {
fn get_values<T>(&self) -> &[T::Native]
where
T: ArrowPrimitiveType,
T::Native: Num,
{
debug_assert_eq!(&T::DATA_TYPE, self.data_type());
let value_buf = &self.buffers()[0];
let offset = self.offset();
let vals = unsafe { value_buf.typed_data::<T::Native>() };
&vals[offset..offset + self.len()]
}
}
impl GetValues for &dyn Array {
fn get_values<T>(&self) -> &[T::Native]
where
T: ArrowPrimitiveType,
T::Native: Num,
{
self.data_ref().get_values::<T>()
}
}
impl GetValues for ArrayRef {
fn get_values<T>(&self) -> &[T::Native]
where
T: ArrowPrimitiveType,
T::Native: Num,
{
self.data_ref().get_values::<T>()
}
}
pub trait ToPrimitive {
fn into_primitive_array<T>(self) -> PrimitiveArray<T>
where
T: ArrowPrimitiveType;
}
impl ToPrimitive for ArrayData {
fn into_primitive_array<T>(self) -> PrimitiveArray<T>
where
T: ArrowPrimitiveType,
{
PrimitiveArray::from(self)
}
}
impl ToPrimitive for &dyn Array {
fn into_primitive_array<T>(self) -> PrimitiveArray<T>
where
T: ArrowPrimitiveType,
{
self.data().clone().into_primitive_array()
}
}
pub trait ValueSize {
fn get_values_size(&self) -> usize;
}
impl ValueSize for ArrayRef {
fn get_values_size(&self) -> usize {
self.data_ref().get_values_size()
}
}
impl ValueSize for ArrayData {
fn get_values_size(&self) -> usize {
match self.data_type() {
DataType::LargeList(_) | DataType::List(_) => {
self.child_data()[0].len() - self.offset()
}
DataType::LargeUtf8 | DataType::Utf8 => self.buffers()[1].len() - self.offset(),
_ => unimplemented!(),
}
}
}
impl ValueSize for LargeListArray {
fn get_values_size(&self) -> usize {
self.data_ref().get_values_size()
}
}
pub trait IsNull {
fn is_null_mask(&self) -> BooleanArray;
fn is_not_null_mask(&self) -> BooleanArray;
}
impl IsNull for &dyn Array {
fn is_null_mask(&self) -> BooleanArray {
if self.null_count() == 0 {
(0..self.len()).map(|_| Some(false)).collect()
} else {
let data = self.data();
let valid = data.null_buffer().unwrap();
let invert = !valid;
let array_data = ArrayData::builder(DataType::Boolean)
.len(self.len())
.offset(self.offset())
.add_buffer(invert)
.build();
BooleanArray::from(array_data)
}
}
fn is_not_null_mask(&self) -> BooleanArray {
if self.null_count() == 0 {
(0..self.len()).map(|_| Some(true)).collect()
} else {
let data = self.data();
let valid = data.null_buffer().unwrap().clone();
let array_data = ArrayData::builder(DataType::Boolean)
.len(self.len())
.offset(self.offset())
.add_buffer(valid)
.build();
BooleanArray::from(array_data)
}
}
}
fn finish_listarray(
field: Field,
child_data: ArrayData,
offsets: MutableBuffer,
null_buf: BooleanBufferBuilder,
) -> LargeListArray {
let data = ArrayData::builder(DataType::LargeList(Box::new(field)))
.len(null_buf.len())
.add_buffer(offsets.into())
.add_child_data(child_data)
.null_bit_buffer(null_buf.into())
.build();
LargeListArray::from(data)
}
macro_rules! iter_to_values {
($iterator:expr, $null_buf:expr, $offsets:expr, $length_so_far:expr) => {{
$iterator
.filter_map(|opt_iter| match opt_iter {
Some(x) => {
let it = x.into_iter();
$length_so_far += it.size_hint().0 as i64;
$null_buf.append(true);
$offsets.push($length_so_far);
Some(it)
}
None => {
$null_buf.append(false);
None
}
})
.flatten()
.collect()
}};
}
pub trait ListFromIter {
unsafe fn from_iter_primitive_trusted_len<T, P, I>(iter: I) -> LargeListArray
where
T: ArrowNumericType,
P: IntoIterator<Item = Option<T::Native>>,
I: IntoIterator<Item = Option<P>>,
{
let iterator = iter.into_iter();
let (lower, _) = iterator.size_hint();
let mut offsets = MutableBuffer::new((lower + 1) * std::mem::size_of::<i64>());
let mut length_so_far = 0i64;
offsets.push(length_so_far);
let mut null_buf = BooleanBufferBuilder::new(lower);
let values: PrimitiveArray<T> = iter_to_values!(iterator, null_buf, offsets, length_so_far);
let field = Field::new("item", T::DATA_TYPE, true);
finish_listarray(field, values.data().clone(), offsets, null_buf)
}
unsafe fn from_iter_bool_trusted_len<I, P>(iter: I) -> LargeListArray
where
I: IntoIterator<Item = Option<P>>,
P: IntoIterator<Item = Option<bool>>,
{
let iterator = iter.into_iter();
let (lower, _) = iterator.size_hint();
let mut offsets = MutableBuffer::new((lower + 1) * std::mem::size_of::<i64>());
let mut length_so_far = 0i64;
offsets.push(length_so_far);
let mut null_buf = BooleanBufferBuilder::new(lower);
let values: BooleanArray = iter_to_values!(iterator, null_buf, offsets, length_so_far);
let field = Field::new("item", DataType::Boolean, true);
finish_listarray(field, values.data().clone(), offsets, null_buf)
}
unsafe fn from_iter_utf8_trusted_len<I, P, Ref>(iter: I, n_elements: usize) -> LargeListArray
where
I: IntoIterator<Item = Option<P>>,
P: IntoIterator<Item = Option<Ref>>,
Ref: AsRef<str>,
{
let iterator = iter.into_iter();
let (lower, _) = iterator.size_hint();
let mut offsets = MutableBuffer::new((lower + 1) * std::mem::size_of::<i64>());
let mut length_so_far = 0i64;
offsets.push(length_so_far);
let mut null_buf = BooleanBufferBuilder::new(lower);
let values: LargeStringArray = iterator
.filter_map(|opt_iter| match opt_iter {
Some(x) => {
let it = x.into_iter();
length_so_far += it.size_hint().0 as i64;
null_buf.append(true);
offsets.push(length_so_far);
Some(it)
}
None => {
null_buf.append(false);
None
}
})
.flatten()
.trust_my_length(n_elements)
.collect();
let field = Field::new("item", DataType::LargeUtf8, true);
finish_listarray(field, values.data().clone(), offsets, null_buf)
}
}
impl ListFromIter for LargeListArray {}
#[cfg(test)]
mod test {
use super::*;
use arrow::array::{Array, Int32Array};
#[test]
fn test_is_null() {
let arr = Int32Array::from(vec![Some(0), None, Some(2)]);
let a: &dyn Array = &arr;
assert_eq!(
a.is_null_mask()
.iter()
.map(|v| v.unwrap())
.collect::<Vec<_>>(),
&[false, true, false]
);
assert_eq!(
a.is_not_null_mask()
.iter()
.map(|v| v.unwrap())
.collect::<Vec<_>>(),
&[true, false, true]
);
}
}