polars_compute/if_then_else/
list.rs

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use arrow::array::growable::{Growable, GrowableList};
use arrow::array::{Array, ArrayCollectIterExt, ListArray};
use arrow::bitmap::Bitmap;

use super::{if_then_else_extend, IfThenElseKernel};

impl IfThenElseKernel for ListArray<i64> {
    type Scalar<'a> = Box<dyn Array>;

    fn if_then_else(mask: &Bitmap, if_true: &Self, if_false: &Self) -> Self {
        let mut growable = GrowableList::new(vec![if_true, if_false], false, mask.len());
        unsafe {
            if_then_else_extend(
                &mut growable,
                mask,
                |g, off, len| g.extend(0, off, len),
                |g, off, len| g.extend(1, off, len),
            )
        };
        growable.to()
    }

    fn if_then_else_broadcast_true(
        mask: &Bitmap,
        if_true: Self::Scalar<'_>,
        if_false: &Self,
    ) -> Self {
        let if_true_list: ListArray<i64> =
            std::iter::once(if_true).collect_arr_trusted_with_dtype(if_false.dtype().clone());
        let mut growable = GrowableList::new(vec![&if_true_list, if_false], false, mask.len());
        unsafe {
            if_then_else_extend(
                &mut growable,
                mask,
                |g, _, len| g.extend_copies(0, 0, 1, len),
                |g, off, len| g.extend(1, off, len),
            )
        };
        growable.to()
    }

    fn if_then_else_broadcast_false(
        mask: &Bitmap,
        if_true: &Self,
        if_false: Self::Scalar<'_>,
    ) -> Self {
        let if_false_list: ListArray<i64> =
            std::iter::once(if_false).collect_arr_trusted_with_dtype(if_true.dtype().clone());
        let mut growable = GrowableList::new(vec![if_true, &if_false_list], false, mask.len());
        unsafe {
            if_then_else_extend(
                &mut growable,
                mask,
                |g, off, len| g.extend(0, off, len),
                |g, _, len| g.extend_copies(1, 0, 1, len),
            )
        };
        growable.to()
    }

    fn if_then_else_broadcast_both(
        dtype: arrow::datatypes::ArrowDataType,
        mask: &Bitmap,
        if_true: Self::Scalar<'_>,
        if_false: Self::Scalar<'_>,
    ) -> Self {
        let if_true_list: ListArray<i64> =
            std::iter::once(if_true).collect_arr_trusted_with_dtype(dtype.clone());
        let if_false_list: ListArray<i64> =
            std::iter::once(if_false).collect_arr_trusted_with_dtype(dtype.clone());
        let mut growable =
            GrowableList::new(vec![&if_true_list, &if_false_list], false, mask.len());
        unsafe {
            if_then_else_extend(
                &mut growable,
                mask,
                |g, _, len| g.extend_copies(0, 0, 1, len),
                |g, _, len| g.extend_copies(1, 0, 1, len),
            )
        };
        growable.to()
    }
}