You are viewing a plain text version of this content. The canonical link for it is here.
Posted to dev@hive.apache.org by "Raghotham Murthy (JIRA)" <ji...@apache.org> on 2009/03/11 02:56:50 UTC
[jira] Updated: (HIVE-284) Column pruning after join+group-by query
[ https://issues.apache.org/jira/browse/HIVE-284?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Raghotham Murthy updated HIVE-284:
----------------------------------
Component/s: Query Processor
> Column pruning after join+group-by query
> ----------------------------------------
>
> Key: HIVE-284
> URL: https://issues.apache.org/jira/browse/HIVE-284
> Project: Hadoop Hive
> Issue Type: Improvement
> Components: Query Processor
> Affects Versions: 0.2.0, 0.3.0
> Reporter: Zheng Shao
>
> The query is:
> explain INSERT OVERWRITE TABLE t
> SELECT t1.r, t2.c, sum(t1.v * t2.v)
> FROM t1 join t2 on t1.c = t2.r
> GROUP BY t1.r, t2.c;
> The FileSinkOperator after the join is serializing all 6 columns from the 2 tables (both have 3 columns: r, c, v) instead of the 4 that is needed later.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.