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https://issues.apache.org/jira/browse/DRILL-6435?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16487457#comment-16487457
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Volodymyr Vysotskyi commented on DRILL-6435:
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[~vrozov], thanks for catching this issue, agreed that is should be non-static
as it was done in he most record batch classes.
> 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
>
> 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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