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From "Till Westmann (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (ASTERIXDB-1081) RemoveUnusedAssignAndAggregateRule bug - removes a variable that is used
Date Mon, 14 Sep 2015 17:33:45 GMT

     [ https://issues.apache.org/jira/browse/ASTERIXDB-1081?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Till Westmann updated ASTERIXDB-1081:
-------------------------------------
    Component/s: Optimizer

> 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, Optimizer
>            Reporter: Taewoo Kim
>            Assignee: 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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