Weston Pace created ARROW-13876:
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Summary: [C++] Uniform null handling in compute functions
Key: ARROW-13876
URL: https://issues.apache.org/jira/browse/ARROW-13876
Project: Apache Arrow
Issue Type: Bug
Components: C++
Reporter: Weston Pace
The compute functions today have mixed support for null types.
Unary arithmetic functions (e.g. abs) don't support null arrays
Binary arithmetic functions (e.g. add) support one null array (e.g. int32 +
null) but not both null arrays (i.e. null + null) but they do support both
values being null (e.g. [null] + [null] = [null] if dtype=int32 but not
supported if dtype=null)
Some functions do forward null arrays:
- unique
Some functions output a non-null type given null inputs
- is_null (=> boolean)
- is_valid (=> boolean)
- value_counts (=> struct)
- dictionary_encode (=> dictionary<null>)
- count (=> int64)
Some functions throw an error other than "not implemented"
- list_parent_indices
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