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Parents and children of check-in [876bd21a]

Prevent infinite recursion of in the query planner for some pathological test cases by disabling OR-clause processing upon first recursion. check-in: 9fca05ea user: drh tags: or-opt
Begin an effort to enhance the query planner to do a better job with OR terms in the WHERE clause. This change allows ANDs outside of the OR to be factored into the OR terms if that is helpful in finding better indices. check-in: 876bd21a user: drh tags: or-opt
Enhance the sqlite3_data_count() routine so that it can be used to determine if SQLITE_DONE has been seen on the prepared statement. check-in: 9913996e user: drh tags: trunk