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https://issues.apache.org/jira/browse/IGNITE-24323?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17922263#comment-17922263
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Aleksey Plekhanov commented on IGNITE-24323:
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Green TC bot visa: 
https://tcbot2.sbt-ignite-dev.ru/pr.html?serverId=apache&suiteId=IgniteTests24Java8_RunAll&branchForTc=pull/11833/head&action=Latest
Something broken in TC bot and "Comment JIRA" is not working now.

> Calcite engine. Query execution inside UDF leads to deadlock
> ------------------------------------------------------------
>
>                 Key: IGNITE-24323
>                 URL: https://issues.apache.org/jira/browse/IGNITE-24323
>             Project: Ignite
>          Issue Type: Bug
>            Reporter: Aleksey Plekhanov
>            Assignee: Aleksey Plekhanov
>            Priority: Major
>              Labels: calcite, ise
>          Time Spent: 0.5h
>  Remaining Estimate: 0h
>
> We have striped executor to execute query tasks. Thread for query/fragment on 
> each node is fixed and defined by hash of query ID and fragment ID. If user 
> created user defined function and try to execute some query inside it, it can 
> lead to deadlock, since task execution thread blocked by new synchronous 
> query execution request and the new query can be assigned to the same thread.
> For H2-based SQL engine threads are no binded to the query and there is no 
> such problem.
> For Calcite-based SQL engine we use non thread safe datastructures in tasks. 
> To workaround this problem we can use regular IgniteThreadPoolExecutor, but 
> need to ensure that there are no tasks concurrently executing for the same 
> query/fragment.
> Also, perhaps this approach can affect performance and should be enabled by 
> some property explicitly only for users that require this mode. 
>   



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