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https://issues.apache.org/jira/browse/HIVE-4639?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14272122#comment-14272122
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Gopal V commented on HIVE-4639:
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for the sake of documentation this does not change the ORC format version (i.e
ORC files with hasNull flags can be read by hive-14).
[~leftylev]: FYI.
> Add has null flag to ORC internal index
> ---------------------------------------
>
> Key: HIVE-4639
> URL: https://issues.apache.org/jira/browse/HIVE-4639
> Project: Hive
> Issue Type: Improvement
> Components: File Formats
> Reporter: Owen O'Malley
> Assignee: Prasanth Jayachandran
> Fix For: 0.15.0
>
> Attachments: HIVE-4639.1.patch, HIVE-4639.2.patch, HIVE-4639.3.patch
>
>
> It would enable more predicate pushdown if we added a flag to the index entry
> recording if there were any null values in the column for the 10k rows.
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