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From "Zoltan Haindrich (Jira)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-23298) Disable RS deduplication step in Optimizer if it is run in TezCompiler
Date Mon, 04 May 2020 07:28:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-23298?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17098739#comment-17098739
] 

Zoltan Haindrich commented on HIVE-23298:
-----------------------------------------

I've just run into some small conflicts relating to this changeset - and I was looking into
the diff; and something have caught my eye:
In [correlationoptimizer14.q.out|https://github.com/apache/hive/commit/87fc75424d37025fca358a4bc57c5e72a32941fb#diff-16ac21a9d9aedb5a9ade75adb2454968R1184]
the plan have started using bloom filters/etc - however I don't think stat estimates or anything
have changed which should have caused it.

I don't think it's a major issue - but might worth a look.


> Disable RS deduplication step in Optimizer if it is run in TezCompiler
> ----------------------------------------------------------------------
>
>                 Key: HIVE-23298
>                 URL: https://issues.apache.org/jira/browse/HIVE-23298
>             Project: Hive
>          Issue Type: Improvement
>          Components: Physical Optimizer
>            Reporter: Jesus Camacho Rodriguez
>            Assignee: Jesus Camacho Rodriguez
>            Priority: Major
>             Fix For: 4.0.0
>
>         Attachments: HIVE-23298.1.patch, HIVE-23298.2.patch, HIVE-23298.3.patch, HIVE-23298.patch
>
>
> HIVE-20703 introduced an additional RS deduplication step in TezCompiler. We could possibly
try to disable the one that runs in {{Optimizer}} if we are using Tez so we do not run the
optimization twice.
> This issue is to explore that possibility.



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