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https://issues.apache.org/jira/browse/PARQUET-275?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14533427#comment-14533427
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Alex Levenson commented on PARQUET-275:
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For that matter, projecting in sets shouldn't be allowed either...
> It should not be possible to project away columns of a key in a map in
> parquet-thrift
> -------------------------------------------------------------------------------------
>
> Key: PARQUET-275
> URL: https://issues.apache.org/jira/browse/PARQUET-275
> Project: Parquet
> Issue Type: Bug
> Components: parquet-mr
> Reporter: Alex Levenson
>
> That wouldn't make much sense when re-assembling the map, there could be
> unexpected key collisions
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