[jira] [Commented] (CALCITE-1306) Allow GROUP BY and HAVING to reference SELECT expressions by ordinal and alias

["Rajeshbabu Chintaguntla (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CALCITE-1306?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15907024#comment-15907024 ] 

Rajeshbabu Chintaguntla commented on CALCITE-1306:
--------------------------------------------------

[~julianhyde] FYI I am working on this. Can this issue can be assigned to me?

> Allow GROUP BY and HAVING to reference SELECT expressions by ordinal and alias
> ------------------------------------------------------------------------------
>
>                 Key: CALCITE-1306
>                 URL: https://issues.apache.org/jira/browse/CALCITE-1306
>             Project: Calcite
>          Issue Type: Bug
>            Reporter: Julian Hyde
>            Assignee: Julian Hyde
>              Labels: dialect, phoenix
>
> Allow GROUP BY and HAVING to reference SELECT expressions by ordinal and alias. It is not standard SQL, but MySQL and PostgreSQL allow it.
> See [Stack Overflow: SQL - using alias in Group By|http://stackoverflow.com/questions/3841295/sql-using-alias-in-group-by].
> It would be enabled only by new methods {{isGroupByOrdinal}} and {{isGroupByAlias}} in SqlConformance.
> We might allow alias in the HAVING clause (as described in HIVE-10557) but ordinal does not make sense.
> Expressions that are not available before grouping would be illegal; for instance:
> {code}
> select count(*) as c
> from t
> group by c
> {code}
> We'd also need rules to resolve ambiguous expressions. For instance, in
> {code}
> select e.empno as deptno
> from emp as e join dept as d
> where e.deptno = d.deptno
> group by deptno
> {code}
> does {{deptno}} refer to {{e.deptno}}, {{d.deptno}}, or {{e.empno}}?



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