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Parents and children of check-in [0f9bb901]

Update the query planner to recognize more cases where ORDER BY clauses can be optimized out. Add test cases to verify correct behavior of the ORDER BY optimization when the covering-index-scan optimization is disabled. Fix a harmless compiler warning in the TCL interface. check-in: 956e4d7f user: drh tags: trunk
Fix a query planner problem that only occurs when covering-index-scan is disabled. Fix to tests whose output changed due to the new and more aggressive ORDER BY optimization. Closed-Leaf check-in: 0f9bb901 user: drh tags: qp-enhancements
Further attempts to optimize out unnecessary ORDER BY clauses. check-in: 6744d9a3 user: drh tags: qp-enhancements