[jira] [Commented] (HIVE-21439) Provide an option to reduce lookup overhead for bucketed tables

["Gopal V (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-21439?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16791944#comment-16791944 ] 

Gopal V commented on HIVE-21439:
--------------------------------

{code}
 if (!HiveConf.getVar(pGraphContext.getConf(), HiveConf.ConfVars.HIVE_EXECUTION_ENGINE).equals("tez")) {
{code}

MR can't handle the partial bucket counts.

> Provide an option to reduce lookup overhead for bucketed tables
> ---------------------------------------------------------------
>
>                 Key: HIVE-21439
>                 URL: https://issues.apache.org/jira/browse/HIVE-21439
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Rajesh Balamohan
>            Priority: Trivial
>
> If a table is bucketed, `OpTraitsRulesProcFactory::TableScanRule` ends up verifying if the partitions have got the same number of files as the number of buckets in table. https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/optimizer/metainfo/annotation/OpTraitsRulesProcFactory.java#L185
> In large tables, this turns out to be very time consuming (100s of seconds) operation. It would be good to have an option to by pass this depending on need basis.



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