Eduardo Ponce created ARROW-15118:
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Summary: [C++] Cast kernel always creates and populates null bitmap
Key: ARROW-15118
URL: https://issues.apache.org/jira/browse/ARROW-15118
Project: Apache Arrow
Issue Type: Improvement
Components: C++
Reporter: Eduardo Ponce
Cast kernels seem to always create and populate the null bitmap even if the
input data structure had a `nullptr` null bitmap. This automatic and extra
allocation is not desirable, and not consistent.
It seems some cast kernels use COMPUTED_NO_ALLOCATE and others use the default
(INTERSECTION). We could change INTERSECTION to be a special-case of one input
Array with no null bitmap. The expected behavior is that if the input has no
nulls, don't bother emitting a null bitmap.
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