SET enable_analyzer = 1; DROP TABLE IF EXISTS 02952_disjunction_optimization; CREATE TABLE 02952_disjunction_optimization (a Int32, b String) ENGINE=Memory; INSERT INTO 02952_disjunction_optimization VALUES (1, 'test'), (2, 'test2'), (3, 'another'), (3, ''), (4, ''); SELECT * FROM 02952_disjunction_optimization WHERE a <> 1 AND a <> 2 AND a <> 4; EXPLAIN QUERY TREE SELECT * FROM 02952_disjunction_optimization WHERE a <> 1 AND a <> 2 AND a <> 4; SELECT * FROM 02952_disjunction_optimization WHERE a <> 1 AND a <> 2 AND a <> 4 AND true; EXPLAIN QUERY TREE SELECT * FROM 02952_disjunction_optimization WHERE a <> 1 AND a <> 2 AND a <> 4 AND true; SELECT * FROM 02952_disjunction_optimization WHERE a <> 1 AND a <> 2 AND a <> 4 AND b <> ''; EXPLAIN QUERY TREE SELECT * FROM 02952_disjunction_optimization WHERE a <> 1 AND a <> 2 AND a <> 4 AND b <> ''; SELECT * FROM 02952_disjunction_optimization WHERE a <> 1 AND a <> 2 AND b = '' AND a <> 4; EXPLAIN QUERY TREE SELECT * FROM 02952_disjunction_optimization WHERE a <> 1 AND a <> 2 AND b = '' AND a <> 4; SELECT * FROM 02952_disjunction_optimization WHERE (a <> 1 AND a <> 2 AND a <> 4) OR b = ''; EXPLAIN QUERY TREE SELECT * FROM 02952_disjunction_optimization WHERE (a <> 1 AND a <> 2 AND a <> 4) OR b = ''; DROP TABLE 02952_disjunction_optimization;