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From "Ashutosh Chauhan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-12017) Do not disable CBO by default when number of joins in a query is equal or less than 1
Date Thu, 19 Nov 2015 18:18:11 GMT

    [ https://issues.apache.org/jira/browse/HIVE-12017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15014074#comment-15014074
] 

Ashutosh Chauhan commented on HIVE-12017:
-----------------------------------------

HIVE-12465 is important one. Lets continue it there. Good that after this patch goes in, we
will be doing right thing in default config atleast. We need to fix it regardless, though.
Joining on different key types is rare enough that we can take that up later. We might get
that for free in return path anyway.
Rest of changes LGTM. +1 pending QA run.

> Do not disable CBO by default when number of joins in a query is equal or less than 1
> -------------------------------------------------------------------------------------
>
>                 Key: HIVE-12017
>                 URL: https://issues.apache.org/jira/browse/HIVE-12017
>             Project: Hive
>          Issue Type: Improvement
>          Components: CBO
>    Affects Versions: 2.0.0
>            Reporter: Jesus Camacho Rodriguez
>            Assignee: Jesus Camacho Rodriguez
>         Attachments: HIVE-12017.01.patch, HIVE-12017.02.patch, HIVE-12017.03.patch, HIVE-12017.04.patch,
HIVE-12017.05.patch, HIVE-12017.06.patch, HIVE-12017.07.patch, HIVE-12017.08.patch, HIVE-12017.09.patch,
HIVE-12017.10.patch, HIVE-12017.11.patch, HIVE-12017.12.patch, HIVE-12017.13.patch
>
>
> Instead, we could disable some parts of CBO that are not relevant if the query contains
1 or 0 joins. Implementation should be able to define easily other query patterns for which
we might disable some parts of CBO (in case we want to do it in the future).



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