Re: Negative [VOTE] Issue 149: Restrictions on Ordering expression used with Grouping

[Craig L Russell]

Hi Erik, I think we actually agree, and the wording of my proposal was poor. On Dec 22, 2005, at 5:48 AM, [EMAIL PROTECTED] wrote: -1. In order, I prefer adding columns in SQL (SELECT) as appropriate, but only returning to the user the columns/fields listed in setResult. I agree. Exactly what I meant to say. This: However, the JDO implementation is required to construct valid SQL if the query is being used with a relational datastore. This means that the SQL SELECT might need to have expressions added to the user's Select clause to include expressions in the Grouping and Ordering clauses. should have said this: However, the JDO implementation is required to construct valid SQL if the query is being used with a relational datastore. This means that the SQL SELECT might need to have expressions that are not in the user's Select clause to include expressions in the Grouping and Ordering clauses. These expressions are not returned to the user. Ok? Craig For grouping, I'm ok with raising an exception when expressions are not declared by user Regards, Quoting Craig L Russell <[EMAIL PROTECTED]>: Javadogs, Please reply if you do not agree. Craig On Dec 19, 2005, at 11:25 AM, Craig L Russell wrote: Javadogs, See JIRA issue JDO-243 http://issues.apache.org/jira/browse/JDO-243? page=all Ordering should have the same restrictions as for the Select clause. That is, if grouping is used, only expressions in the Grouping clause and aggregate expressions can be in the Ordering clause. The JDO implementation is not permitted to modify the Select clause, the Grouping clause, or the Ordering clause. These are user- visible and should not be changed by the implementation. However, the JDO implementation is required to construct valid SQL if the query is being used with a relational datastore. This means that the SQL SELECT might need to have expressions added to the user's Select clause to include expressions in the Grouping and Ordering clauses. Today in the specification there are restrictions on the expressions that can be used in the Select clause if there is a Grouping clause: <spec 14.6.10> Only expressions in the Grouping clause and aggregate expressions can be in the Select clause. </spec 14.6.10> A similar restriction is needed for the Ordering clause. <proposed> Only expressions in the Grouping clause and aggregate expressions can be in the Ordering clause. </proposed> Craig Russell Architect, Sun Java Enterprise System http://java.sun.com/products/jdo 408 276-5638 mailto:[EMAIL PROTECTED] P.S. A good JDO? O, Gasp! Craig Russell Architect, Sun Java Enterprise System http://java.sun.com/products/jdo 408 276-5638 mailto:[EMAIL PROTECTED] P.S. A good JDO? O, Gasp! Craig Russell Architect, Sun Java Enterprise System http://java.sun.com/products/jdo 408 276-5638 mailto:[EMAIL PROTECTED] P.S. A good JDO? O, Gasp!

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