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From "Ashutosh Chauhan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-6959) Enable Constant propagation optimizer for Hive Vectorization
Date Sun, 10 Aug 2014 20:28:12 GMT

    [ https://issues.apache.org/jira/browse/HIVE-6959?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14092194#comment-14092194
] 

Ashutosh Chauhan commented on HIVE-6959:
----------------------------------------

+1

> Enable Constant propagation optimizer for Hive Vectorization
> ------------------------------------------------------------
>
>                 Key: HIVE-6959
>                 URL: https://issues.apache.org/jira/browse/HIVE-6959
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Hari Sankar Sivarama Subramaniyan
>            Assignee: Hari Sankar Sivarama Subramaniyan
>         Attachments: HIVE-6959.1.patch, HIVE-6959.2.patch, HIVE-6959.4.patch, HIVE-6959.5.patch,
HIVE-6959.6.patch
>
>
> HIVE-5771 covers Constant propagation optimizer for Hive. Now that HIVE-5771 is committed,
we should remove any vectorization related code which duplicates this feature. For example,
a fn to be cleaned is VectorizarionContext::foldConstantsForUnaryExprs(). In addition to this
change, constant propagation should kick in when vectorization is enabled. i.e. we need to
lift the HIVE_VECTORIZATION_ENABLED restriction inside ConstantPropagate::transform().



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