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From "Chao Sun (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-16328) HoS: more aggressive mapjoin optimization when hive.spark.use.file.size.for.mapjoin is true
Date Wed, 29 Mar 2017 21:57:41 GMT
Chao Sun created HIVE-16328:
-------------------------------

             Summary: HoS: more aggressive mapjoin optimization when hive.spark.use.file.size.for.mapjoin
is true
                 Key: HIVE-16328
                 URL: https://issues.apache.org/jira/browse/HIVE-16328
             Project: Hive
          Issue Type: Bug
          Components: Logical Optimizer
            Reporter: Chao Sun
            Assignee: Chao Sun


In HIVE-15489, when {{hive.spark.use.file.size.for.mapjoin}} is set to true, and if the JOIN
op has any upstream RS operator, then we will stop converting the JOIN op to MAPJOIN op. 

However, this is overly conservative. A better solution is to treat the branch that has upstream
RS as the big table and check if all other branches are map-only AND can fit in hash table
size.



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