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https://issues.apache.org/jira/browse/HIVE-4639?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14268053#comment-14268053
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Owen O'Malley commented on HIVE-4639:
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You should encode four values:
no_values, all_nulls, some_nulls, no_nulls
This will allow you to support a richer set of sargs.
> 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
> Attachments: HIVE-4639.1.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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