From: Michael Bouschen <Michael.Bouschen_at_Sun.COM>
Date: Tue, 21 Feb 2006 19:34:07 +0100

H Tom,

attached you find my changes to validate the SELECT clause in case of a
GROUP BY query. This makes sure that a GROUP BY query only returns
grouping items or aggregates. The corresponding glassfish issue is:
   https://glassfish.dev.java.net/issues/show_bug.cgi?id=166
Please note, the change also includes checking the HAVING expression.
I needed to redefine the getAsString method in a couple of parser tree
nodes in order to give a better error message and might need to do the
same change for more nodes. But this can be added later.

Thanks!

Regards Michael