mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-04 21:42:39 +00:00
24 lines
995 B
MySQL
24 lines
995 B
MySQL
|
SET convert_query_to_cnf = 1;
|
||
|
SET optimize_using_constraints = 1;
|
||
|
|
||
|
DROP TABLE IF EXISTS t_constraints_where;
|
||
|
|
||
|
CREATE TABLE t_constraints_where(a UInt32, b UInt32, CONSTRAINT c1 ASSUME b >= 5, CONSTRAINT c2 ASSUME b <= 10) ENGINE = Memory;
|
||
|
|
||
|
INSERT INTO t_constraints_where VALUES (1, 7);
|
||
|
|
||
|
EXPLAIN SYNTAX SELECT count() FROM t_constraints_where WHERE b > 15; -- assumption -> 0
|
||
|
EXPLAIN SYNTAX SELECT count() FROM t_constraints_where WHERE b = 20; -- assumption -> 0
|
||
|
EXPLAIN SYNTAX SELECT count() FROM t_constraints_where WHERE b < 2; -- assumption -> 0
|
||
|
EXPLAIN SYNTAX SELECT count() FROM t_constraints_where WHERE b > 20 OR b < 8; -- assumption -> remove (b < 20)
|
||
|
|
||
|
DROP TABLE t_constraints_where;
|
||
|
|
||
|
CREATE TABLE t_constraints_where(a UInt32, b UInt32, CONSTRAINT c1 ASSUME b < 10) ENGINE = Memory;
|
||
|
|
||
|
INSERT INTO t_constraints_where VALUES (1, 7);
|
||
|
|
||
|
EXPLAIN SYNTAX SELECT count() FROM t_constraints_where WHERE b = 1 OR b < 18 OR b > 5; -- assumtion -> (b < 20) -> 0;
|
||
|
|
||
|
DROP TABLE t_constraints_where;
|