tustvold commented on code in PR #3558:
URL: https://github.com/apache/arrow-rs/pull/3558#discussion_r1073983917
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arrow-select/src/dictionary.rs:
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@@ -0,0 +1,171 @@
+use crate::interleave::interleave;
+use arrow_array::builder::BooleanBufferBuilder;
+use arrow_array::cast::{as_generic_binary_array, as_largestring_array,
as_string_array};
+use arrow_array::types::{ArrowDictionaryKeyType, ByteArrayType};
+use arrow_array::{Array, ArrayRef, DictionaryArray, GenericByteArray};
+use arrow_buffer::{ArrowNativeType, Buffer, MutableBuffer};
+use arrow_data::bit_iterator::BitIndexIterator;
+use arrow_schema::{ArrowError, DataType};
+use std::collections::hash_map::Entry;
+use std::collections::HashMap;
+
+/// Given an array of dictionaries and an optional row mask compute a values
array
+/// containing all unique, reference values, along with mappings from the
[`DictionaryArray`]
+/// keys to the new keys within this values array
+pub fn merge_dictionaries<K: ArrowDictionaryKeyType>(
+ dictionaries: &[(&DictionaryArray<K>, Option<&[u8]>)],
Review Comment:
I plan to use the masks for the interleave kernel
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