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https://issues.apache.org/jira/browse/PARQUET-283?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alex Levenson resolved PARQUET-283.
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    Resolution: Fixed

> 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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