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https://issues.apache.org/jira/browse/HIVE-7215?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14029632#comment-14029632
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Prasanth J commented on HIVE-7215:
----------------------------------

bq. If there is a non null check, will the row group which has all nulls be 
ignored?
Yes. Thats correct.

HIVE-4639 addresses the improvement that I mentioned (having boolean flag 
within 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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