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Posted to dev@hive.apache.org by "Rajesh Balamohan (JIRA)" <ji...@apache.org> on 2019/03/13 09:38:00 UTC

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

Rajesh Balamohan created HIVE-21439:
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             Summary: 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


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 operation. It would be good to have an option to by pass this depending on need basis.



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