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Posted to dev@hive.apache.org by "Lefty Leverenz (JIRA)" <ji...@apache.org> on 2015/02/08 00:57:34 UTC

[jira] [Commented] (HIVE-4639) Add has null flag to ORC internal index

    [ https://issues.apache.org/jira/browse/HIVE-4639?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14311024#comment-14311024 ] 

Lefty Leverenz commented on HIVE-4639:
--------------------------------------

Doc note:  [~prasanth_j] documented this in the ORC wiki.

* [ORC -- Column Statistics | https://cwiki.apache.org/confluence/display/Hive/LanguageManual+ORC#LanguageManualORC-ColumnStatistics]

But it says the hasNull flag is added in 1.2.0 -- shouldn't that be 1.1.0, since this jira's fix version is 0.15?

> 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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