[jira] [Created] (TAJO-974) Eliminate unexpected case condition in SubQuery

["Hyunsik Choi (JIRA)" <ji...@apache.org>]

Hyunsik Choi created TAJO-974:
---------------------------------

             Summary: Eliminate unexpected case condition in SubQuery
                 Key: TAJO-974
                 URL: https://issues.apache.org/jira/browse/TAJO-974
             Project: Tajo
          Issue Type: Bug
          Components: distributed query plan
            Reporter: Hyunsik Choi
             Fix For: 0.9.0


Please take a loot at the below code. In SubQuery::calculateShuffleOutputNum() method, if-condition will be passed through the unexpected case if the plan is neither group by and join. In current implementation, distinct group-by operator can cause this case. Actually, the below code is messy. We need to directly handle distinct group by and clean up the below code.

{code:title="SubQuery::calculateShuffleOutputNum()"}
} else {
        LOG.info("============>>>>> Unexpected Case! <<<<<================");
        long volume = getInputVolume(subQuery.masterPlan, subQuery.context, subQuery.block);
{code}



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