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https://issues.apache.org/jira/browse/HIVE-7215?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14029592#comment-14029592
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Rohini Palaniswamy commented on HIVE-7215:
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bq. However, ORC reads the row group even in the opposite case, the case where
there are no nulls in column within the row group.
That is what my concern was. This amounts to no predicate pushdown as it is
going to read all row groups irrespective of whether there are nulls. So will
leave this jira open to address that.
bq. if col is completely null in a row group, ORC predicate pushdown evaluates
to true (based on null statistics) and reads the row group.
If there is a non null check, will the row group which has all nulls be
ignored?
> 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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