[jira] [Resolved] (ARROW-15846) [Format] Clarify presence of Struct array validity bitmap

["Antoine Pitrou (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-15846?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Antoine Pitrou resolved ARROW-15846.
------------------------------------
    Resolution: Fixed

Issue resolved by pull request 12599
[https://github.com/apache/arrow/pull/12599]

> [Format] Clarify presence of Struct array validity bitmap
> ---------------------------------------------------------
>
>                 Key: ARROW-15846
>                 URL: https://issues.apache.org/jira/browse/ARROW-15846
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: Format
>            Reporter: Antoine Pitrou
>            Assignee: Antoine Pitrou
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 8.0.0
>
>          Time Spent: 2h 50m
>  Remaining Estimate: 0h
>
> The following wording in the format spec is a bit ambiguous:
> bq.  A struct array must still have an allocated validity bitmap, if it has one or more null values.
> https://arrow.apache.org/docs/format/Columnar.html#struct-layout
> This can be misinterpreted as meaning that a struct array with no nulls does not have any buffer at all. In reality, it has an "absent" validity buffer (e.g. with 0 length).



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