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Posted to jira@arrow.apache.org by "Antoine Pitrou (Jira)" <ji...@apache.org> on 2022/03/04 14:09:00 UTC

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

Antoine Pitrou created ARROW-15846:
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             Summary: [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
             Fix For: 8.0.0


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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