[Hibernate-issues] [Hibernate-JIRA] Commented: (HHH-892) HQL parser does not resolve alias in ORDER BY clause

[Armin H. (JIRA) <no...@at...>]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-892?page=comments#action_20712 ] 

Armin Haaf commented on HHH-892:
--------------------------------

I think this is inconsistent behaviour and therefore a bug. It is possible to alias a "standard" select column, but it is not possible to a alias a aggregate column.

But there is another workaround, which should work on all environments:

SELECT SUM(A.x)  FROM MyClass AS A GROUP BY A.y ORDER BY SUM(A.x)

This workaround may be performance relevant, because not every database is optimizing this.

> HQL parser does not resolve alias in ORDER  BY clause
> -----------------------------------------------------
>
>          Key: HHH-892
>          URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-892
>      Project: Hibernate3
>         Type: New Feature
>     Versions: 3.0.5
>  Environment: Hibernate 3.0.5, MySQL, Tomcat
>     Reporter: Guido Laures
>     Priority: Minor

>
>
> When using an alias for an ORDER BY clause this is not always correctly resolved. Example:
> SELECT SUM(A.x) AS mySum FROM MyClass AS A GROUP BY A.y ORDER BY mySum
> does not work because "mySum" is not resolved in the ORDER BY clause which results in an exception telling that mySum is an unknown column.
> Workaround (not to say "hack") is using:
> SELECT SUM(A.x) AS mySum FROM MyClass AS A GROUP BY A.y ORDER BY col_0_0_

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