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https://issues.apache.org/jira/browse/HIVE-7215?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14029533#comment-14029533
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Prasanth J commented on HIVE-7215:
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It reads the entire row group.
However, ORC reads the row group even in the opposite case, the case where
there are no nulls in column within the row group. This can be improved by
having boolean flag/#nulls within row group index.
> Support predicate pushdown for null checks in ORCFile
> -----------------------------------------------------
>
> Key: HIVE-7215
> URL: https://issues.apache.org/jira/browse/HIVE-7215
> Project: Hive
> Issue Type: Improvement
> Reporter: Rohini Palaniswamy
>
> Came across this missing feature during discussion of PIG-3760.
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