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From "Gunther Hagleitner (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-4579) Create a SARG interface for RecordReaders
Date Mon, 12 Aug 2013 02:02:48 GMT

    [ https://issues.apache.org/jira/browse/HIVE-4579?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13736487#comment-13736487
] 

Gunther Hagleitner commented on HIVE-4579:
------------------------------------------

20/20S look good, but compile fails for 23 because of missing mina dependency (IdentityHashSet
in test code). Will fix, upload new patch and commit.
                
> Create a SARG interface for RecordReaders
> -----------------------------------------
>
>                 Key: HIVE-4579
>                 URL: https://issues.apache.org/jira/browse/HIVE-4579
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Owen O'Malley
>            Assignee: Owen O'Malley
>         Attachments: h-4579.patch, HIVE-4579.D11409.1.patch, HIVE-4579.D11409.2.patch,
HIVE-4579.D11409.3.patch, pushdown.pdf
>
>
> I think we should create a SARG (http://en.wikipedia.org/wiki/Sargable) interface for
RecordReaders. For a first pass, I'll create an API that uses the value stored in hive.io.filter.expr.serialized.
> The desire is to define an simpler interface that the direct AST expression that is provided
by hive.io.filter.expr.serialized so that the code to evaluate expressions can be generalized
instead of put inside a particular RecordReader.

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