SET enable_optimize_predicate_expression = 0; SET convert_query_to_cnf = 0; SET cross_to_inner_join_rewrite = 1; DROP TABLE IF EXISTS t1; DROP TABLE IF EXISTS t2; DROP TABLE IF EXISTS t3; DROP TABLE IF EXISTS t4; CREATE TABLE t1 (a UInt32, b Nullable(Int32)) ENGINE = Memory; CREATE TABLE t2 (a UInt32, b Nullable(Int32)) ENGINE = Memory; CREATE TABLE t3 (a UInt32, b Nullable(Int32)) ENGINE = Memory; CREATE TABLE t4 (a UInt32, b Nullable(Int32)) ENGINE = Memory; SET enable_analyzer = 0; --- EXPLAIN SYNTAX (old AST based optimization) SELECT countIf(explain like '%COMMA%' OR explain like '%CROSS%'), countIf(explain like '%INNER%') FROM ( EXPLAIN SYNTAX SELECT t1.a FROM t1, t2 WHERE t1.a = t2.a); SELECT countIf(explain like '%COMMA%' OR explain like '%CROSS%'), countIf(explain like '%INNER%') FROM ( EXPLAIN SYNTAX SELECT t1.a FROM t1, t2 WHERE t1.b = t2.b); SELECT countIf(explain like '%COMMA%' OR explain like '%CROSS%'), countIf(explain like '%INNER%') FROM ( EXPLAIN SYNTAX SELECT t1.a FROM t1, t2, t3 WHERE t1.a = t2.a AND t1.a = t3.a); SELECT countIf(explain like '%COMMA%' OR explain like '%CROSS%'), countIf(explain like '%INNER%') FROM ( EXPLAIN SYNTAX SELECT t1.a FROM t1, t2, t3 WHERE t1.b = t2.b AND t1.b = t3.b); SELECT countIf(explain like '%COMMA%' OR explain like '%CROSS%'), countIf(explain like '%INNER%') FROM ( EXPLAIN SYNTAX SELECT t1.a FROM t1, t2, t3, t4 WHERE t1.a = t2.a AND t1.a = t3.a AND t1.a = t4.a); SELECT countIf(explain like '%COMMA%' OR explain like '%CROSS%'), countIf(explain like '%INNER%') FROM ( EXPLAIN SYNTAX SELECT t1.a FROM t1, t2, t3, t4 WHERE t1.b = t2.b AND t1.b = t3.b AND t1.b = t4.b); SELECT countIf(explain like '%COMMA%' OR explain like '%CROSS%'), countIf(explain like '%INNER%') FROM ( EXPLAIN SYNTAX SELECT t1.a FROM t1, t2, t3, t4 WHERE t2.a = t1.a AND t2.a = t3.a AND t2.a = t4.a); SELECT countIf(explain like '%COMMA%' OR explain like '%CROSS%'), countIf(explain like '%INNER%') FROM ( EXPLAIN SYNTAX SELECT t1.a FROM t1, t2, t3, t4 WHERE t3.a = t1.a AND t3.a = t2.a AND t3.a = t4.a); SELECT countIf(explain like '%COMMA%' OR explain like '%CROSS%'), countIf(explain like '%INNER%') FROM ( EXPLAIN SYNTAX SELECT t1.a FROM t1, t2, t3, t4 WHERE t4.a = t1.a AND t4.a = t2.a AND t4.a = t3.a); SELECT countIf(explain like '%COMMA%' OR explain like '%CROSS%'), countIf(explain like '%INNER%') FROM ( EXPLAIN SYNTAX SELECT t1.a FROM t1, t2, t3, t4 WHERE t1.a = t2.a AND t2.a = t3.a AND t3.a = t4.a); SELECT countIf(explain like '%COMMA%' OR explain like '%CROSS%'), countIf(explain like '%INNER%') FROM ( EXPLAIN SYNTAX SELECT t1.a FROM t1, t2, t3, t4); SELECT countIf(explain like '%COMMA%' OR explain like '%CROSS%'), countIf(explain like '%INNER%') FROM ( EXPLAIN SYNTAX SELECT t1.a FROM t1 CROSS JOIN t2 CROSS JOIN t3 CROSS JOIN t4); SELECT countIf(explain like '%COMMA%' OR explain like '%CROSS%'), countIf(explain like '%INNER%') FROM ( EXPLAIN SYNTAX SELECT t1.a FROM t1, t2 CROSS JOIN t3); SELECT countIf(explain like '%COMMA%' OR explain like '%CROSS%'), countIf(explain like '%INNER%') FROM ( EXPLAIN SYNTAX SELECT t1.a FROM t1 JOIN t2 USING a CROSS JOIN t3); SELECT countIf(explain like '%COMMA%' OR explain like '%CROSS%'), countIf(explain like '%INNER%') FROM ( EXPLAIN SYNTAX SELECT t1.a FROM t1 JOIN t2 ON t1.a = t2.a CROSS JOIN t3); --- EXPLAIN QUERY TREE SELECT countIf(explain like '%COMMA%' OR explain like '%CROSS%'), countIf(explain like '%INNER%') FROM ( EXPLAIN QUERY TREE SELECT t1.a FROM t1, t2 WHERE t1.a = t2.a) SETTINGS enable_analyzer = 1; SELECT countIf(explain like '%COMMA%' OR explain like '%CROSS%'), countIf(explain like '%INNER%') FROM ( EXPLAIN QUERY TREE SELECT t1.a FROM t1, t2 WHERE t1.b = t2.b) SETTINGS enable_analyzer = 1; SELECT countIf(explain like '%COMMA%' OR explain like '%CROSS%'), countIf(explain like '%INNER%') FROM ( EXPLAIN QUERY TREE SELECT t1.a FROM t1, t2, t3 WHERE t1.a = t2.a AND t1.a = t3.a) SETTINGS enable_analyzer = 1; SELECT countIf(explain like '%COMMA%' OR explain like '%CROSS%'), countIf(explain like '%INNER%') FROM ( EXPLAIN QUERY TREE SELECT t1.a FROM t1, t2, t3 WHERE t1.b = t2.b AND t1.b = t3.b) SETTINGS enable_analyzer = 1; SELECT countIf(explain like '%COMMA%' OR explain like '%CROSS%'), countIf(explain like '%INNER%') FROM ( EXPLAIN QUERY TREE SELECT t1.a FROM t1, t2, t3, t4 WHERE t1.a = t2.a AND t1.a = t3.a AND t1.a = t4.a) SETTINGS enable_analyzer = 1; SELECT countIf(explain like '%COMMA%' OR explain like '%CROSS%'), countIf(explain like '%INNER%') FROM ( EXPLAIN QUERY TREE SELECT t1.a FROM t1, t2, t3, t4 WHERE t1.b = t2.b AND t1.b = t3.b AND t1.b = t4.b) SETTINGS enable_analyzer = 1; SELECT countIf(explain like '%COMMA%' OR explain like '%CROSS%'), countIf(explain like '%INNER%') FROM ( EXPLAIN QUERY TREE SELECT t1.a FROM t1, t2, t3, t4 WHERE t2.a = t1.a AND t2.a = t3.a AND t2.a = t4.a) SETTINGS enable_analyzer = 1; SELECT countIf(explain like '%COMMA%' OR explain like '%CROSS%'), countIf(explain like '%INNER%') FROM ( EXPLAIN QUERY TREE SELECT t1.a FROM t1, t2, t3, t4 WHERE t3.a = t1.a AND t3.a = t2.a AND t3.a = t4.a) SETTINGS enable_analyzer = 1; SELECT countIf(explain like '%COMMA%' OR explain like '%CROSS%'), countIf(explain like '%INNER%') FROM ( EXPLAIN QUERY TREE SELECT t1.a FROM t1, t2, t3, t4 WHERE t4.a = t1.a AND t4.a = t2.a AND t4.a = t3.a) SETTINGS enable_analyzer = 1; SELECT countIf(explain like '%COMMA%' OR explain like '%CROSS%'), countIf(explain like '%INNER%') FROM ( EXPLAIN QUERY TREE SELECT t1.a FROM t1, t2, t3, t4 WHERE t1.a = t2.a AND t2.a = t3.a AND t3.a = t4.a) SETTINGS enable_analyzer = 1; SELECT countIf(explain like '%COMMA%' OR explain like '%CROSS%'), countIf(explain like '%INNER%') FROM ( EXPLAIN QUERY TREE SELECT t1.a FROM t1, t2, t3, t4) SETTINGS enable_analyzer = 1; SELECT countIf(explain like '%COMMA%' OR explain like '%CROSS%'), countIf(explain like '%INNER%') FROM ( EXPLAIN QUERY TREE SELECT t1.a FROM t1 CROSS JOIN t2 CROSS JOIN t3 CROSS JOIN t4) SETTINGS enable_analyzer = 1; SELECT countIf(explain like '%COMMA%' OR explain like '%CROSS%'), countIf(explain like '%INNER%') FROM ( EXPLAIN QUERY TREE SELECT t1.a FROM t1, t2 CROSS JOIN t3) SETTINGS enable_analyzer = 1; SELECT countIf(explain like '%COMMA%' OR explain like '%CROSS%'), countIf(explain like '%INNER%') FROM ( EXPLAIN QUERY TREE SELECT t1.a FROM t1 JOIN t2 USING a CROSS JOIN t3) SETTINGS enable_analyzer = 1; SELECT countIf(explain like '%COMMA%' OR explain like '%CROSS%'), countIf(explain like '%INNER%') FROM ( EXPLAIN QUERY TREE SELECT t1.a FROM t1 JOIN t2 ON t1.a = t2.a CROSS JOIN t3) SETTINGS enable_analyzer = 1; INSERT INTO t1 values (1,1), (2,2), (3,3), (4,4); INSERT INTO t2 values (1,1), (1, Null); INSERT INTO t3 values (1,1), (1, Null); INSERT INTO t4 values (1,1), (1, Null); SET enable_analyzer = 1; SELECT 'SELECT * FROM t1, t2'; SELECT * FROM t1, t2 ORDER BY t1.a, t2.b; SELECT 'SELECT * FROM t1, t2 WHERE t1.a = t2.a'; SELECT * FROM t1, t2 WHERE t1.a = t2.a ORDER BY t1.a, t2.b; SELECT 'SELECT t1.a, t2.a FROM t1, t2 WHERE t1.b = t2.b'; SELECT t1.a, t2.b FROM t1, t2 WHERE t1.b = t2.b; SELECT 'SELECT t1.a, t2.b, t3.b FROM t1, t2, t3 WHERE t1.a = t2.a AND t1.a = t3.a'; SELECT t1.a, t2.b, t3.b FROM t1, t2, t3 WHERE t1.a = t2.a AND t1.a = t3.a ORDER BY t2.b, t3.b; SELECT 'SELECT t1.a, t2.b, t3.b FROM t1, t2, t3 WHERE t1.b = t2.b AND t1.b = t3.b'; SELECT t1.a, t2.b, t3.b FROM t1, t2, t3 WHERE t1.b = t2.b AND t1.b = t3.b; SELECT 'SELECT t1.a, t2.b, t3.b, t4.b FROM t1, t2, t3, t4 WHERE t1.a = t2.a AND t1.a = t3.a AND t1.a = t4.a'; SELECT t1.a, t2.b, t3.b, t4.b FROM t1, t2, t3, t4 WHERE t1.a = t2.a AND t1.a = t3.a AND t1.a = t4.a ORDER BY t2.b, t3.b, t4.b; SELECT 'SELECT t1.a, t2.b, t3.b, t4.b FROM t1, t2, t3, t4 WHERE t1.b = t2.b AND t1.b = t3.b AND t1.b = t4.b'; SELECT t1.a, t2.b, t3.b, t4.b FROM t1, t2, t3, t4 WHERE t1.b = t2.b AND t1.b = t3.b AND t1.b = t4.b; SELECT 'SELECT t1.a, t2.b, t3.b, t4.b FROM t1, t2, t3, t4 WHERE t1.a = t2.a AND t2.a = t3.a AND t3.a = t4.a'; SELECT t1.a, t2.b, t3.b, t4.b FROM t1, t2, t3, t4 WHERE t1.a = t2.a AND t2.a = t3.a AND t3.a = t4.a ORDER BY t2.b, t3.b, t4.b; DROP TABLE t1; DROP TABLE t2; DROP TABLE t3; DROP TABLE t4;