[jira] [Created] (IMPALA-5381) Add query option to control join strategy w/o when tables have no stats

["Greg Rahn (JIRA)" <ji...@apache.org>]

Greg Rahn created IMPALA-5381:
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             Summary: Add query option to control join strategy w/o when tables have no stats
                 Key: IMPALA-5381
                 URL: https://issues.apache.org/jira/browse/IMPALA-5381
             Project: IMPALA
          Issue Type: New Feature
          Components: Frontend
            Reporter: Greg Rahn


In IMPALA-5120 the join strategy was changed from bcast to shuffle when tables have no stats.  Adding a query option to specify the behavior lowers the risk that users may have come to rely on this behavior.  This would allow them to revert back to the previous behavior.

Query option proposal:
{noformat}
default_join_strategy = [ broadcast | shuffle ] 
{noformat}
The default would be shuffle.



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