GitHub user takaaki7 edited a comment on the discussion: [Format] Inline parent 
validity bitmap into child validity bitmap

Accessing Arrow Struct children requires checking both parent and child 
validity (p[i] && c[i]), which can feel cumbersome. For example, Java's 
StructVector.getChild(), needing explicit parent.isNull(i) checks.
I think setting the child's validity bit to null at the format level when the 
parent is null would reduce burden and overhead for users.

ref:
https://arrow.apache.org/blog/2022/10/08/arrow-parquet-encoding-part-2/

GitHub link: 
https://github.com/apache/arrow/discussions/46086#discussioncomment-12788496

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