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