mkleen commented on code in PR #8963:
URL: https://github.com/apache/arrow-rs/pull/8963#discussion_r2655129915
##########
arrow-select/src/zip.rs:
##########
@@ -657,6 +665,181 @@ fn maybe_prep_null_mask_filter(predicate: &BooleanArray)
-> BooleanBuffer {
}
}
+struct ByteViewScalarImpl<T: ByteViewType> {
+ truthy: Option<GenericByteViewArray<T>>,
+ falsy: Option<GenericByteViewArray<T>>,
+ phantom: PhantomData<T>,
+}
+
+impl<T: ByteViewType> ByteViewScalarImpl<T> {
+ fn new(truthy: &dyn Array, falsy: &dyn Array) -> Self {
+ Self {
+ truthy: Self::get_value_from_scalar(truthy),
+ falsy: Self::get_value_from_scalar(falsy),
+ phantom: PhantomData,
+ }
+ }
+
+ fn get_value_from_scalar(scalar: &dyn Array) ->
Option<GenericByteViewArray<T>> {
+ if scalar.is_null(0) {
+ None
+ } else {
+ Some(scalar.as_byte_view().clone())
+ }
+ }
+
+ fn get_scalar_buffers_and_nulls_for_all_values_null(
+ len: usize,
+ ) -> (ScalarBuffer<u128>, Vec<Buffer>, Option<NullBuffer>) {
+ let mut mutable = MutableBuffer::with_capacity(0);
+ mutable.repeat_slice_n_times((0u128).to_byte_slice(), len);
+
+ (mutable.into(), vec![], Some(NullBuffer::new_null(len)))
+ }
+
+ fn get_scalar_buffers_and_nulls_for_single_non_nullable(
+ predicate: BooleanBuffer,
+ value: &GenericByteViewArray<T>,
+ ) -> (ScalarBuffer<u128>, Vec<Buffer>, Option<NullBuffer>) {
+ let number_of_true = predicate.count_set_bits();
+ let number_of_values = predicate.len();
+
+ // Fast path for all nulls
+ if number_of_true == 0 {
+ // All values are null
+ return
Self::get_scalar_buffers_and_nulls_for_all_values_null(number_of_values);
+ }
+ let view = value.views()[0].to_byte_slice();
+ let mut bytes = MutableBuffer::with_capacity(0);
+ bytes.repeat_slice_n_times(view, number_of_values);
+
+ let bytes = Buffer::from(bytes);
+
+ // If a value is true we need the TRUTHY and the null buffer will have
1 (meaning not null)
+ // If a value is false we need the FALSY and the null buffer will have
0 (meaning null)
Review Comment:
i updated the comment, i hope this is better understandable now. what it
means is if the value is supposed to be a truthy or falsy when the function is
called.
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