[jira] [Updated] (ARROW-15118) [C++] Avoid bitmap buffer if all inputs are all valid for Scalar Kernels

["Eduardo Ponce (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-15118?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Eduardo Ponce updated ARROW-15118:
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    Summary: [C++] Avoid bitmap buffer if all inputs are all valid for Scalar Kernels  (was: [C++] Cast kernel always creates and populates null bitmap)

> [C++] Avoid bitmap buffer if all inputs are all valid for Scalar Kernels
> ------------------------------------------------------------------------
>
>                 Key: ARROW-15118
>                 URL: https://issues.apache.org/jira/browse/ARROW-15118
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>            Reporter: Eduardo Ponce
>            Assignee: Pradeep Garigipati
>            Priority: Minor
>              Labels: good-second-issue, kernel, pull-request-available
>             Fix For: 8.0.0
>
>          Time Spent: 2h
>  Remaining Estimate: 0h
>
> 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_PREALLOCATE and others use the default (INTERSECTION). We could change INTERSECTION to be a general case where if all inputs have no nulls, then a null bitmap should not be emitted.



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