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https://issues.apache.org/jira/browse/PARQUET-227?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14380673#comment-14380673
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Ryan Blue commented on PARQUET-227:
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Should we define a type annotation for unions? That way Avro, Thrift, and Hive
unions could be compatible. That would also be a good opportunity to
standardize behavior, so if a union has multiple non-null values we have
predictable behavior for interpreting the data across object models. Obviously,
this wouldn't block your work here.
> Parquet thrift can write unions that have 0 or more than 1 set value
> --------------------------------------------------------------------
>
> Key: PARQUET-227
> URL: https://issues.apache.org/jira/browse/PARQUET-227
> Project: Parquet
> Issue Type: Bug
> Components: parquet-mr
> Reporter: Alex Levenson
> Assignee: Alex Levenson
>
> Having 0 or more than 1 set values means the data will be unreadable in the
> read path, this should not be allowed in the write path.
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