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Posted to dev@hive.apache.org by "Rajesh Balamohan (JIRA)" <ji...@apache.org> on 2017/05/24 04:34:04 UTC

[jira] [Created] (HIVE-16746) Reduce number of index lookups for same table in IndexWhereTaskDispatcher

Rajesh Balamohan created HIVE-16746:
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             Summary: Reduce number of index lookups for same table in IndexWhereTaskDispatcher
                 Key: HIVE-16746
                 URL: https://issues.apache.org/jira/browse/HIVE-16746
             Project: Hive
          Issue Type: Bug
            Reporter: Rajesh Balamohan
            Priority: Minor


{{IndexWhereTaskDispatcher}} is used when {{hive.optimize.index.filter=true}}. It lists all indices for the table and depending on the query complexity, this ends up being in the hotpath. For e.g, Q14 explain plan takes 180-200 seconds and this index querying multiple times for same tables take up 30-40 seconds. This function was invoked around 24000 times for same set of tables.




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