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From "Jesus Camacho Rodriguez (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-12393) Simplify ColumnPruner when CBO optimizes the query
Date Fri, 20 Nov 2015 09:11:10 GMT

    [ https://issues.apache.org/jira/browse/HIVE-12393?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15015461#comment-15015461
] 

Jesus Camacho Rodriguez commented on HIVE-12393:
------------------------------------------------

It does not need to be included in 2.0.0. More work needs to be done...

> Simplify ColumnPruner when CBO optimizes the query
> --------------------------------------------------
>
>                 Key: HIVE-12393
>                 URL: https://issues.apache.org/jira/browse/HIVE-12393
>             Project: Hive
>          Issue Type: Bug
>          Components: Logical Optimizer
>    Affects Versions: 2.0.0
>            Reporter: Jesus Camacho Rodriguez
>            Assignee: Jesus Camacho Rodriguez
>
> The plan for any given query optimized by CBO will always contain a Project operator
on top of the TS that prunes that columns that are not needed.
> Thus, there is no need for Hive optimizer to traverse the whole plan to check which columns
can be pruned. In fact, Hive ColumnPruner optimizer only needs to match TS operators when
CBO optimized the plan.



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