1set enable_seqscan=off; 2 3CREATE TABLE test_char ( 4 i "char" 5); 6 7INSERT INTO test_char VALUES ('a'),('b'),('c'),('d'),('e'),('f'); 8 9CREATE INDEX idx_char ON test_char USING gin (i); 10 11SELECT * FROM test_char WHERE i<'d'::"char" ORDER BY i; 12SELECT * FROM test_char WHERE i<='d'::"char" ORDER BY i; 13SELECT * FROM test_char WHERE i='d'::"char" ORDER BY i; 14SELECT * FROM test_char WHERE i>='d'::"char" ORDER BY i; 15SELECT * FROM test_char WHERE i>'d'::"char" ORDER BY i; 16