hive-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Phabricator (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-3315) Propagates filters which are on the join condition transitively
Date Mon, 24 Sep 2012 06:32:07 GMT

    [ https://issues.apache.org/jira/browse/HIVE-3315?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13461621#comment-13461621
] 

Phabricator commented on HIVE-3315:
-----------------------------------

navis has commented on the revision "HIVE-3315 [jira] Propagate filers on inner join condition
transitively".

  This is a little old issue and I've forgot what was this for. I've taken sometime for remind.

  I agree on what you said generally (too complex) and re-implemented as you said, except
filter propagation of outer joins. For inner/semi join, filters can be propagated freely(L
to R and R to L). But for left-outer join, could it be propagated in L to R only? (R to L
for RO)

  I'm still cannot sure of this. I'll update after full test.

REVISION DETAIL
  https://reviews.facebook.net/D4497

To: JIRA, navis
Cc: njain

                
> Propagates filters which are on the join condition transitively 
> ----------------------------------------------------------------
>
>                 Key: HIVE-3315
>                 URL: https://issues.apache.org/jira/browse/HIVE-3315
>             Project: Hive
>          Issue Type: Improvement
>          Components: Query Processor
>    Affects Versions: 0.10.0
>            Reporter: Navis
>            Assignee: Navis
>            Priority: Minor
>         Attachments: HIVE-3315.1.patch.txt, HIVE-3315.2.patch.txt, HIVE-3315.3.patch.txt
>
>
> explain select src1.key from src src1 join src src2 on src1.key=src2.key and src1.key
< 100;
> In this case, filter on join condition src1.key < 100 can be propagated transitively
to src2 by src2.key < 100. 

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira

Mime
View raw message