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From "Phabricator (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-4246) Implement predicate pushdown for ORC
Date Fri, 09 Aug 2013 23:28:47 GMT

    [ https://issues.apache.org/jira/browse/HIVE-4246?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13735498#comment-13735498
] 

Phabricator commented on HIVE-4246:
-----------------------------------

omalley has commented on the revision "HIVE-4246 [jira] Implement predicate pushdown for ORC".

INLINE COMMENTS
  ql/src/java/org/apache/hadoop/hive/ql/exec/TableScanOperator.java:244 I need the names,
because the SARGs are based on column names instead of ids.
  ql/src/java/org/apache/hadoop/hive/ql/io/orc/RecordReaderImpl.java:1483 They really aren't
an enum, they are positions in a number stream.
  ql/src/java/org/apache/hadoop/hive/ql/io/sarg/SearchArgument.java:142 +1
  ql/src/test/org/apache/hadoop/hive/ql/io/orc/TestInStream.java:128 +1

REVISION DETAIL
  https://reviews.facebook.net/D11415

To: JIRA, omalley
Cc: hagleitn

                
> Implement predicate pushdown for ORC
> ------------------------------------
>
>                 Key: HIVE-4246
>                 URL: https://issues.apache.org/jira/browse/HIVE-4246
>             Project: Hive
>          Issue Type: New Feature
>          Components: File Formats
>            Reporter: Owen O'Malley
>            Assignee: Owen O'Malley
>         Attachments: HIVE-4246.D11415.1.patch
>
>
> By using the push down predicates from the table scan operator, ORC can skip over 10,000
rows at a time that won't satisfy the predicate. This will help a lot, especially if the file
is sorted by the column that is used in the predicate.

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