Revision 516454

DERBY-681: Remove the "wrap group by's in a subselect" rewrite in the parser.
This patch preserves the having clause through bind and optimize phases and
then, during the final rewrite for aggregates in the GroupByNode, it transforms
the having clause to a valid restriction. See text file attached to the Jira
for more information.

Contributed by Manish Khettry (manish_khettry@yahoo.com)