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From "Taewoo Kim (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ASTERIXDB-1081) RemoveUnusedAssignAndAggregateRule bug - removes a variable that is used
Date Sat, 22 Aug 2015 16:12:45 GMT
Taewoo Kim created ASTERIXDB-1081:
-------------------------------------

             Summary: RemoveUnusedAssignAndAggregateRule bug - removes a variable that is
used
                 Key: ASTERIXDB-1081
                 URL: https://issues.apache.org/jira/browse/ASTERIXDB-1081
             Project: Apache AsterixDB
          Issue Type: Bug
          Components: AsterixDB
            Reporter: Taewoo Kim


RemoveUnusedAssignAndAggregateRule removes a variable that is used in the one of two paths
after SPLIT (REPLICATE) operator. In my branch, I am trying to optimize the index-search.
In order to implement this, there is an ASSIGN operator and it assigns a variable that is
going to be used in the SELECT operator. After ASSIGN, there is SPLIT operator. It divides
the path into two - the left path contains the SELECT and the other path contains no operator.
Two paths will be merged by UNION operator. 

The issue is RemoveUnusedAssignAndAggregateRule can't consider all paths at the same time.
Thus, when it checks the right path, it removes one variable in the ASSIGN before SPLIT since
it thinks that the variable is not used after ASSIGN operator. In fact, the variable is used
in the left path. 



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