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Parents and children of check-in [4fcdc7a2]

Additional steps to help ensure that scalar subqueries are only evaluated once even if they are used in multiple places within the query. This fixes a performance regression reported on the mailing list and caused by check-in [531eca6104e41e43] which was a fix for ticket [787fa716be3a7f650c]. Think of this check-in as an improved fix for that ticket. check-in: e1303193 user: drh tags: trunk
Remove an optimization that can no longer occur, being superceded by the subquery-reuse optimization. Put an assert in place of the optimization to detect if the need for this optimization ever returns. Closed-Leaf check-in: 4fcdc7a2 user: drh tags: reuse-subqueries
Merge enhancements and bug fixes from trunk. check-in: 9fb646f2 user: drh tags: reuse-subqueries