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https://issues.apache.org/jira/browse/ASTERIXDB-1081?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15507962#comment-15507962
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ASF subversion and git services commented on ASTERIXDB-1081:
------------------------------------------------------------
Commit e89ad03baa16e92b3116e2c49e48d8e7fe6f2789 in asterixdb's branch
refs/heads/master from [~wangsaeu]
[ https://git-wip-us.apache.org/repos/asf?p=asterixdb.git;h=e89ad03 ]
ASTERIXDB-1081, ASTERIXDB-1086, ASTERIXDB-1246: proper multiple plan paths
handling
- ASTERIXDB-1081: Fixed RemoveUnusedAssignAndAggregateRule to reflect multiple
paths in the plan.
- ASTERIXDB-1086: Fixed IntroduceProjectsRule to reflect multiples paths in
the plan.
- ASTERIXDB-1246: Fixed RemoveRedundantGroupByDecorVarsRule to remove
duplicate/unnecessary
decor variables before IntroduceProjects rule fires.
Change-Id: I69e055572f024f28a857d4e64916b4806e63c083
Reviewed-on: https://asterix-gerrit.ics.uci.edu/1073
Sonar-Qube: Jenkins <[email protected]>
Tested-by: Jenkins <[email protected]>
Reviewed-by: Yingyi Bu <[email protected]>
Integration-Tests: Jenkins <[email protected]>
> 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
> Labels: with-index-only
>
> 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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