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https://issues.apache.org/jira/browse/DRILL-5151?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15768644#comment-15768644
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Chunhui Shi commented on DRILL-5151:
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The fix is on calcite side.
> ConventionTraitDef.plannerConversionMap is not thread safe
> ----------------------------------------------------------
>
> Key: DRILL-5151
> URL: https://issues.apache.org/jira/browse/DRILL-5151
> Project: Apache Drill
> Issue Type: Bug
> Components: Query Planning & Optimization
> Reporter: Chunhui Shi
> Assignee: Chunhui Shi
>
> We are using static instance ConventionTraitDef.INSTANCE globally and
> plannerConversionMap(class WeakHashMap) defined in ConventionTraitDef class
> is not threadsafe. And the data in the map could corrupt and cause dead loop
> or other data error.
>
> private final WeakHashMap<RelOptPlanner, ConversionData>
> plannerConversionMap =
> new WeakHashMap<RelOptPlanner, ConversionData>();
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