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https://issues.apache.org/jira/browse/FLINK-16924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17073318#comment-17073318
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Danny Chen commented on FLINK-16924:
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Not sure if the table env is ready for multi-threading, but at least i can give
a protection for RelMetadataQuery from Calcite side.
> TableEnvironment#sqlUpdate throw NPE when called in async thread
> ----------------------------------------------------------------
>
> Key: FLINK-16924
> URL: https://issues.apache.org/jira/browse/FLINK-16924
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / Planner
> Affects Versions: 1.11.0
> Reporter: Terry Wang
> Priority: Major
> Attachments: 7871C046-4D67-49C8-AC8A-A4030A7981CC.png
>
>
> Now in the latest code of flink master branch, we encountered unexpected npe
> exception as the picture like attachments.
> It seems that I can reproduce this problem by creating tableEnv and doing
> some operations in main thread and then calling sqlQuery or sqlUpdate in
> another async thread.
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