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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-4639) Add has null flag to ORC internal index
Date Wed, 07 Jan 2015 19:20:35 GMT

    [ https://issues.apache.org/jira/browse/HIVE-4639?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14268053#comment-14268053
] 

Owen O'Malley commented on HIVE-4639:
-------------------------------------

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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