set extra_float_digits =0; SELECT set_smlar_limit(0.6); SELECT t, ARRAY( SELECT v::varchar(1)::"char" FROM generate_series(1, t) as v ) AS v INTO test_char FROM generate_series(1, 200) as t; SELECT t, smlar(v, '{3,2,1}') AS s FROM test_char WHERE v % '{3,2,1}' ORDER BY s DESC, t; CREATE INDEX idx_test_char ON test_char USING gist (v _char_sml_ops); SET enable_seqscan=off; SELECT t, smlar(v, '{3,2,1}') AS s FROM test_char WHERE v % '{3,2,1}' ORDER BY s DESC, t; DROP INDEX idx_test_char; CREATE INDEX idx_test_char ON test_char USING gin (v _char_sml_ops); SELECT t, smlar(v, '{3,2,1}') AS s FROM test_char WHERE v % '{3,2,1}' ORDER BY s DESC, t; SET enable_seqscan=on;