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https://issues.apache.org/jira/browse/CALCITE-520?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17226401#comment-17226401
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Julian Hyde commented on CALCITE-520:
-------------------------------------
That sounds about right. Also add a test, of course.
Cancel is, by its nature, a multi-threaded operation (definitely on the client,
possibly on the server) so be careful about thread-safety.
> Support cancel in remote JDBC driver
> ------------------------------------
>
> Key: CALCITE-520
> URL: https://issues.apache.org/jira/browse/CALCITE-520
> Project: Calcite
> Issue Type: Bug
> Components: avatica
> Reporter: Julian Hyde
> Priority: Major
>
> Remote JDBC driver should support canceling running statements.
> I believe we have the ingredients already. The client knows the statement id
> of a statement before it executes it. And when cancel is received in the
> client JDBC driver, it can send a (new) CancelStatement request on a separate
> RPC call. The server can then set the cancel flag, and from that point, the
> mechanism is the same as local cancel.
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