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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