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From "Wei Zheng (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-11193) ConstantPropagateProcCtx should use a Set instead of a List to hold operators to be deleted
Date Thu, 09 Jul 2015 23:09:04 GMT

    [ https://issues.apache.org/jira/browse/HIVE-11193?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14621426#comment-14621426
] 

Wei Zheng commented on HIVE-11193:
----------------------------------

Here's the link for that change: https://docs.oracle.com/javase/8/docs/technotes/guides/collections/changes8.html

> ConstantPropagateProcCtx should use a Set instead of a List to hold operators to be deleted
> -------------------------------------------------------------------------------------------
>
>                 Key: HIVE-11193
>                 URL: https://issues.apache.org/jira/browse/HIVE-11193
>             Project: Hive
>          Issue Type: Bug
>          Components: Logical Optimizer
>            Reporter: Wei Zheng
>            Assignee: Wei Zheng
>         Attachments: HIVE-11193.01.patch, HIVE-11193.02.patch, HIVE-11193.03.patch
>
>
> During Constant Propagation optimization, sometimes a node ends up being added to opToDelete
list more than once.
> Later in ConstantPropagate transform, we try to delete that operator multiple times,
which will cause SemanticException since the node has already been removed in an earlier pass.
> The data structure for storing opToDelete is List. We should use Set to avoid the problem.



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