[jira] [Resolved] (CALCITE-2628) JDBC adapter throws NullPointerException while generating GROUP BY query for MySQL

["Julian Hyde (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CALCITE-2628?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Julian Hyde resolved CALCITE-2628.
----------------------------------
       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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