Joins involving where statements with a partition do not prune correctly in left outer join -------------------------------------------------------------------------------------------
Key: HIVE-2677 URL: https://issues.apache.org/jira/browse/HIVE-2677 Project: Hive Issue Type: Bug Affects Versions: 0.7.0 Reporter: Jakob Homan The following query: {noformat} select t1.id as m_id, count(t2.id) as totals from table1 t1 left outer join table2 t2 on (t1.id = t2.id) where (datepartition == '2011-11-08-00') group by t1.id;{noformat} should prune to just a single partition (datepartition == '2011-11-08-00') . However, the filter is being applied in the reducer, so a full table scan is being done as part of the map. One can get the correct behavior by pushing the filter into a select statement within the join itself: {noformat}select t1.id as m_id, count(p.id) as totals from table1 t1 left outer join (select * from table2 where datepartition == '2011-11-08-00') t2 on (t1.id = t2.id) group by t1.id;{noformat} -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira