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From "Laljo John Pullokkaran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-12356) Capture if a rule mutated the plan.
Date Thu, 19 Nov 2015 23:16:11 GMT

    [ https://issues.apache.org/jira/browse/HIVE-12356?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15014712#comment-15014712
] 

Laljo John Pullokkaran commented on HIVE-12356:
-----------------------------------------------

Yes, this is to reduce Hive Compilation cost.

> Capture if a rule mutated the plan.
> -----------------------------------
>
>                 Key: HIVE-12356
>                 URL: https://issues.apache.org/jira/browse/HIVE-12356
>             Project: Hive
>          Issue Type: Bug
>    Affects Versions: 1.2.0
>            Reporter: Laljo John Pullokkaran
>            Assignee: Laljo John Pullokkaran
>
> Currently Hive Optimizer doesn't capture if a rule mutated the plan.
> This info could be useful in:
> 1. determining if a subsequent optimization rule needs to be run or not
>    (Ex if Constant propagation didn't mutate plan, then don't run subsequent PPD)
> 2. Explain can contain info about which optimizations are applied effectively on the
query.



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