method returns SQLITE_CONSTRAINT then that particular combination of
constraints is considered unusable and does not participate further in
query planning.
FossilOrigin-Name: 684013cef6bfcfd920a4aec645df9f5d41ace8b34e75fca61759c1b4f82cc89e
syntax from being used to optimize any scan not related to the virtual table
for which it was specified as an argument.
FossilOrigin-Name: 4d46685f282409f7154be288719cbea4b743d7ea5315a55a91462003497469f7
