[jira] [Created] (DRILL-6435) MappingSet is stateful, so it can't be shared between threads

[Vlad Rozov (JIRA)]

Vlad Rozov created DRILL-6435:
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             Summary: 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


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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