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https://issues.apache.org/jira/browse/CALCITE-2628?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Julian Hyde resolved CALCITE-2628.
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Resolution: Fixed
Fix Version/s: 1.18.0
Fixed in
[784372deb|http://git-wip-us.apache.org/repos/asf/calcite/commit/784372deb].
> JDBC adapter throws NullPointerException while generating GROUP BY query for
> MySQL
> ----------------------------------------------------------------------------------
>
> Key: CALCITE-2628
> URL: https://issues.apache.org/jira/browse/CALCITE-2628
> Project: Calcite
> Issue Type: Bug
> Reporter: Julian Hyde
> Assignee: Julian Hyde
> Priority: Major
> Fix For: 1.18.0
>
>
> JDBC adapter throws NullPointerException or ClassCastException while
> generating GROUP BY query for MySQL.
> The problem is that MySQL does not support nested aggregates, and if the
> input to the query is either a table or an un-expected 'select \*', the code
> that looks for the input expression to an aggregate function does not see a
> SqlSelectNode (and therefore throws ClassCastException) or runs off the end
> of the un-expanded '\*' (giving a NullPointerException).
> See test cases in RelToSqlConverterTest.
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