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https://issues.apache.org/jira/browse/DRILL-6435?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16488461#comment-16488461
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ASF GitHub Bot commented on DRILL-6435:
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paul-rogers commented on issue #1286: DRILL-6435: MappingSet is stateful, so it
can't be shared between threads
URL: https://github.com/apache/drill/pull/1286#issuecomment-391595679
Thanks much for the explanation: I learned something new!
+1
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> MappingSet is stateful, so it can't be shared between threads
> -------------------------------------------------------------
>
> Key: DRILL-6435
> URL: https://issues.apache.org/jira/browse/DRILL-6435
> Project: Apache Drill
> Issue Type: Bug
> Reporter: Vlad Rozov
> Assignee: Vlad Rozov
> Priority: Major
> Fix For: 1.14.0
>
>
> There are several instances where static {{MappingSet}} instances are used
> (for example {{NestedLoopJoinBatch}} and {{BaseSortWrapper}}). This causes
> instance reuse across threads when queries are executed concurrently. As
> {{MappingSet}} is a stateful class with visitor design pattern, such reuse
> causes invalid state.
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