tustvold commented on code in PR #7716:
URL: https://github.com/apache/arrow-rs/pull/7716#discussion_r2157184797
##########
arrow-select/src/dictionary.rs:
##########
@@ -23,10 +29,76 @@ use arrow_array::types::{
LargeUtf8Type, Utf8Type,
};
use arrow_array::{cast::AsArray, downcast_primitive};
-use arrow_array::{Array, ArrayRef, DictionaryArray, GenericByteArray,
PrimitiveArray};
-use arrow_buffer::{ArrowNativeType, BooleanBuffer, ScalarBuffer, ToByteSlice};
+use arrow_array::{
+ downcast_dictionary_array, AnyDictionaryArray, Array, ArrayRef,
ArrowNativeTypeOp,
+ BooleanArray, DictionaryArray, GenericByteArray, PrimitiveArray,
+};
+use arrow_buffer::{ArrowNativeType, BooleanBuffer, MutableBuffer,
ScalarBuffer, ToByteSlice};
use arrow_schema::{ArrowError, DataType};
+/// Garbage collects a [DictionaryArray] by removing unreferenced values.
+pub fn garbage_collect_dictionary<K: ArrowDictionaryKeyType>(
+ dictionary: &DictionaryArray<K>,
+) -> Result<DictionaryArray<K>, ArrowError> {
+ let keys = dictionary.keys();
+ let values = dictionary.values();
+
Review Comment:
https://docs.rs/arrow-array/latest/arrow_array/array/struct.DictionaryArray.html#method.occupancy
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