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https://issues.apache.org/jira/browse/PARQUET-283?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14545112#comment-14545112
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Alex Levenson commented on PARQUET-283:
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https://github.com/apache/parquet-mr/pull/189
> Parquet-Thrift does not handle dropping values in a map
> -------------------------------------------------------
>
> Key: PARQUET-283
> URL: https://issues.apache.org/jira/browse/PARQUET-283
> Project: Parquet
> Issue Type: Bug
> Components: parquet-mr
> Reporter: Alex Levenson
> Assignee: Alex Levenson
>
> Thrift does not have a notion of null, and it does not treat map values as
> optional. We need to apply the same trick as we do for unions to map values
> -- keep at least 1 primitive column even when the values of the map are not
> requested.
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