sqlite3_index_constraint.usage field. Do not try to handle ORDER BY terms with
explicit COLLATE clauses - they don't get passed to the vtab layer anyway.
FossilOrigin-Name: 0cd75a872c89958a7f418720a0e8c6f638f8284c488f666015c19136feae6be8
all candidate indexes in the report output by the sqlite3_expert program.
FossilOrigin-Name: 0c45c5eb9f0f171b8d7c5f0d2973f9f59915467506cdff1450f3e4b2134a01ca
API in sqlite3expert.h) instead of by invoking the sqlite3_expert application.
Fix memory leaks and other problems.
FossilOrigin-Name: 5dd9831721b70a89a26728adcd49c7f6103ef8266891a79c2db34d913702709e