Attempt to omit ORDER BY clauses from FROM-clause subqueries if those ORDER BY

Attempt to omit ORDER BY clauses from FROM-clause subqueries if those ORDER BY
clauses do not affect the output.  See
[forum:/forumpost/2d76f2bcf65d256a|forum thread 2d76f2bcf65d256a] for
discussion.  This can help the query flattener in
some cases, resulting in faster query plans.  The current implemention does
not always work.

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