hive-dev mailing list archives

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


Phabricator commented on HIVE-3315:

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

  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.


To: JIRA, navis
Cc: njain

> Propagates filters which are on the join condition transitively 
> ----------------------------------------------------------------
>                 Key: HIVE-3315
>                 URL:
>             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:

View raw message