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Posted to dev@hive.apache.org by "jiraposter@reviews.apache.org (JIRA)" <ji...@apache.org> on 2011/08/04 23:27:30 UTC
[jira] [Commented] (HIVE-1989) recognize transitivity of predicates
on join keys
[ https://issues.apache.org/jira/browse/HIVE-1989?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13079607#comment-13079607 ]
jiraposter@reviews.apache.org commented on HIVE-1989:
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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/1228/
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(Updated 2011-08-04 21:26:16.036333)
Review request for hive.
Changes
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Fix "bugs" field
Summary
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https://issues.apache.org/jira/browse/HIVE-1989
This addresses bug HIVE-1989.
https://issues.apache.org/jira/browse/HIVE-1989
Diffs
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http://svn.apache.org/repos/asf/hive/trunk/ql/src/java/org/apache/hadoop/hive/ql/optimizer/ColumnPrunerProcFactory.java 1152395
http://svn.apache.org/repos/asf/hive/trunk/ql/src/java/org/apache/hadoop/hive/ql/ppd/OpProcFactory.java 1152395
Diff: https://reviews.apache.org/r/1228/diff
Testing
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Thanks,
Charles
> recognize transitivity of predicates on join keys
> -------------------------------------------------
>
> Key: HIVE-1989
> URL: https://issues.apache.org/jira/browse/HIVE-1989
> Project: Hive
> Issue Type: Improvement
> Components: Query Processor
> Affects Versions: 0.6.0
> Reporter: John Sichi
> Assignee: Charles Chen
> Attachments: HIVE-1989v1.patch
>
>
> Given
> {noformat}
> set hive.mapred.mode=strict;
> create table invites (foo int, bar string) partitioned by (ds string);
> create table invites2 (foo int, bar string) partitioned by (ds string);
> select count(*) from invites join invites2 on invites.ds=invites2.ds where invites.ds='2011-01-01';
> {noformat}
> currently an error occurs:
> {noformat}
> Error in semantic analysis: No Partition Predicate Found for Alias "invites2" Table "invites2"
> {noformat}
> The optimizer should be able to infer a predicate on invites2 via transitivity. The current lack places a burden on the user to add a redundant predicate, and makes impossible (at least in strict mode) join views where both underlying tables are partitioned (the join select list has to pick one of the tables arbitrarily).
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