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https://issues.apache.org/jira/browse/ARROW-9603?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Micah Kornfield reassigned ARROW-9603:
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Assignee: Micah Kornfield
> [C++][Parquet] Write Arrow relies on unspecified behavior for nested types
> --------------------------------------------------------------------------
>
> Key: ARROW-9603
> URL: https://issues.apache.org/jira/browse/ARROW-9603
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++
> Reporter: Micah Kornfield
> Assignee: Micah Kornfield
> Priority: Major
>
> parquet/column_writer.cc WriteArrow implementations at certain points checks
> null counts/required data and passes through the null bitmap for encoding.
> This only works for nested data types if the if the null slot on a parent
> implies a null slot on the leaf. This relationship is not required by the
> specifications.
>
> Most paths for creating arrays follow this pattern so it would be esoteric to
> hit this bug, but we should still fix it.
>
> All branches that rely on reading nullness should generate a new null bitmap
> based on definition levels if the column is nested, and decisions should be
> based off of that.
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