Rich-T-kid commented on code in PR #12223:
URL: https://github.com/apache/arrow-rs/pull/12223#discussion_r4559289265
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arrow-select/src/coalesce/byte.rs:
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@@ -4,14 +4,21 @@
use super::InProgressArray;
use crate::filter::{FilterIndices, FilterPredicate, FilterSelection};
+use crate::take::{TakeOptions, take};
use arrow_array::builder::GenericByteBuilder;
use arrow_array::cast::AsArray;
use arrow_array::types::ByteArrayType;
-use arrow_array::{Array, ArrayRef, GenericByteArray, OffsetSizeTrait};
+use arrow_array::{Array, ArrayRef, GenericByteArray, OffsetSizeTrait,
UInt32Array};
use arrow_buffer::ArrowNativeType;
use arrow_schema::ArrowError;
use std::sync::Arc;
+const INDEXED_COPY_MAX_SELECTIVITY_DENOMINATOR: usize = 1024;
+
+fn should_use_indexed_copy(input_rows: usize, selected_rows: usize) -> bool {
+ selected_rows <= input_rows / INDEXED_COPY_MAX_SELECTIVITY_DENOMINATOR
+}
+
Review Comment:
need to get the benchmarks for 0.1/0.8 better
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