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Posted to dev@hive.apache.org by "John Sichi (JIRA)" <ji...@apache.org> on 2011/02/14 21:03:57 UTC
[jira] Updated: (HIVE-1989) recognize transitivity of predicates on
join keys
[ https://issues.apache.org/jira/browse/HIVE-1989?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
John Sichi updated HIVE-1989:
-----------------------------
Summary: recognize transitivity of predicates on join keys (was: recognize transitive join conditions)
> 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
>
> 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 and 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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