hive-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "John Sichi (JIRA)" <j...@apache.org>
Subject [jira] Created: (HIVE-1989) recognize transitive join conditions
Date Mon, 14 Feb 2011 19:59:58 GMT
recognize transitive join conditions
------------------------------------

                 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).


-- 
This message is automatically generated by JIRA.
-
For more information on JIRA, see: http://www.atlassian.com/software/jira

        

Mime
View raw message