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4 Commits

Author SHA1 Message Date
drh 325eff58d6 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.

FossilOrigin-Name: 956e4d7f8958e7065ff2d61cd71519d6f4113d4a
 2012-10-03 12:56:18 +00:00
drh d663b5bdef Further attempts to optimize out unnecessary ORDER BY clauses. 
FossilOrigin-Name: 6744d9a37faffed59b4d5cb96c8671ec46a87ea7
 2012-10-03 00:25:54 +00:00
drh 178eb61c6b Only continue an ORDER BY optimization into inner loops if the equality 
constraints on the inner loop match terms of an outer ordered index that
are actually used by the ORDER BY clause.

FossilOrigin-Name: b0e7b4df6c2a8c479f8d210bde50c737eaa248f0
 2012-10-02 14:11:29 +00:00
drh 60441af4f2 Improved ORDER BY optimization when outer loops of a join return a single row. 
FossilOrigin-Name: 62225b4a4c4bfe1820ef54cb202edf2cd866429f
 2012-09-29 19:10:29 +00:00