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# This file is a collection of regression and coverage tests # for WL#5855: Print EXPLAIN in JSON format --source include/have_innodb.inc set @save_storage_engine= @@default_storage_engine; set default_storage_engine=MyISAM; set end_markers_in_json=on; --echo # new "FORMAT" keyword doesn't conflict with the FORMAT() function name: SELECT FORMAT(1, 2), FORMAT(1, 2, 3); --echo # new "FORMAT" keyword is a valid identifier: SET @FORMAT=10; SELECT @FORMAT; CREATE TABLE t1 (format INT); SELECT format FROM t1; DROP TABLE t1; --echo # different ways of format name writing: EXPLAIN FORMAT=traditional SELECT 1; EXPLAIN FORMAT='TrAdItIoNaL' SELECT 1; EXPLAIN FORMAT=JSON SELECT 1; --error ER_UNKNOWN_EXPLAIN_FORMAT EXPLAIN FORMAT=foo SELECT 1; --echo # various EXPLAIN output CREATE TABLE t1 (i INT); CREATE TABLE t2 (i INT); CREATE TABLE t3 (i INT); CREATE TABLE t4 (i INT); --echo # no end markers in JSON: set end_markers_in_json=off; EXPLAIN FORMAT=JSON SELECT * FROM t1; set end_markers_in_json=on; EXPLAIN INSERT INTO t1 VALUES (10); EXPLAIN FORMAT=JSON INSERT INTO t1 VALUES (10); EXPLAIN SELECT * FROM t1; PREPARE stmt FROM 'EXPLAIN FORMAT=JSON SELECT * FROM t1'; EXECUTE stmt; EXECUTE stmt; INSERT INTO t1 VALUES (1), (2), (3), (4), (5), (6), (7); INSERT INTO t2 VALUES (1), (2); EXPLAIN SELECT * FROM (SELECT * FROM (SELECT * FROM (SELECT a1.i FROM (SELECT * FROM t1) a1, t2) a2) a3) a4; EXPLAIN FORMAT=JSON SELECT * FROM (SELECT * FROM (SELECT * FROM (SELECT a1.i FROM (SELECT * FROM t1) a1, t2) a2) a3) a4; --echo # subquery in WHERE EXPLAIN SELECT * FROM t1 WHERE i IN (SELECT i FROM t2 WHERE t1.i = 10 ORDER BY RAND()); EXPLAIN FORMAT=JSON SELECT * FROM t1 WHERE i IN (SELECT i FROM t2 WHERE t1.i = 10 ORDER BY RAND()); --echo # two subqueries in WHERE EXPLAIN SELECT * FROM t1 WHERE i IN (SELECT i FROM t2 WHERE t1.i = 10 ORDER BY RAND()) OR i IN (SELECT i FROM t4 ORDER BY RAND()); EXPLAIN FORMAT=JSON SELECT * FROM t1 WHERE i IN (SELECT i FROM t2 WHERE t1.i = 10 ORDER BY RAND()) OR i IN (SELECT i FROM t4 ORDER BY RAND()); --echo # simple UNION EXPLAIN SELECT * FROM t1 UNION SELECT * FROM t2 UNION SELECT * FROM t3; EXPLAIN FORMAT=JSON SELECT * FROM t1 UNION SELECT * FROM t2 UNION SELECT * FROM t3; --echo # more complex UNION EXPLAIN (SELECT t1.i FROM t1 JOIN t2) UNION ALL (SELECT * FROM t3 WHERE i IN (SELECT i FROM t4 ORDER BY RAND())); EXPLAIN FORMAT=JSON (SELECT t1.i FROM t1 JOIN t2) UNION ALL (SELECT * FROM t3 WHERE i IN (SELECT i FROM t4 ORDER BY RAND())); --echo # UNION with subquery in outer ORDER BY EXPLAIN (SELECT * FROM t1) UNION (SELECT * FROM t2) ORDER BY (SELECT i LIMIT 1); EXPLAIN FORMAT=JSON (SELECT * FROM t1) UNION (SELECT * FROM t2) ORDER BY (SELECT i LIMIT 1); --echo # optimizer-time subquery --let $query=SELECT * FROM t1 ORDER BY (SELECT LENGTH(1) FROM t2 LIMIT 1) --eval EXPLAIN $query --eval EXPLAIN FORMAT=JSON $query --echo # subquery in the HAVING clause --let $query=SELECT * FROM t1 HAVING i > ALL (SELECT i FROM t2) OR i < ALL (SELECT i FROM t2); --eval EXPLAIN $query --eval EXPLAIN FORMAT=JSON $query --echo # subquery in the GROUP BY clause --let $query=SELECT * FROM t1 GROUP BY i > ALL (SELECT i FROM t2) OR i < ALL (SELECT i FROM t2); --eval EXPLAIN $query --eval EXPLAIN FORMAT=JSON $query --echo # subquery in the SELECT list --let $query=SELECT (SELECT i + 1 FROM t1 ORDER BY RAND() LIMIT 1), i FROM t1; --eval EXPLAIN $query --eval EXPLAIN FORMAT=JSON $query DROP TABLE t1, t2, t3, t4; --echo # derived table that is optimized out CREATE TABLE t1 (i INT); EXPLAIN SELECT 1 FROM (SELECT 1 AS x FROM t1) tt WHERE x; EXPLAIN FORMAT= JSON SELECT 1 FROM (SELECT 1 AS x FROM t1) tt WHERE x; DROP TABLE t1; --echo # complex subqueries CREATE TABLE t1 (a INT, b INT); CREATE TABLE t2 (c INT, d INT); CREATE TABLE t3 (e INT); CREATE TABLE t4 (f INT, g INT); INSERT INTO t1 VALUES (1,10), (2,10); INSERT INTO t2 VALUES (2,10), (2,20); INSERT INTO t3 VALUES (10), (30); INSERT INTO t4 VALUES (2,10), (2,10); --let $query = SELECT * FROM t1 WHERE t1.a IN (SELECT c FROM t2 WHERE (SELECT e FROM t3) < SOME(SELECT e FROM t3 WHERE t1.b)); --eval EXPLAIN $query --eval EXPLAIN FORMAT=JSON $query DROP TABLE t1, t2, t3, t4; --echo # semi-join materialization (if enabled) CREATE TABLE t1 (a INT); INSERT INTO t1 VALUES (1), (1), (1); CREATE TABLE t2 (a INT) SELECT * FROM t1; CREATE TABLE t3 (a INT) SELECT * FROM t1; CREATE TABLE t4 (a INT) SELECT * FROM t1; EXPLAIN FORMAT=JSON SELECT * FROM t1 WHERE t1.a IN (SELECT t2.a FROM t2 WHERE t2.a > 0) AND t1.a IN (SELECT t3.a FROM t3 WHERE t3.a IN (SELECT t4.a FROM t4 WHERE a > 0)); DROP TABLE t1, t2, t3, t4; --echo # the same subquery is associated with two different JOIN_TABs CREATE TABLE t1 ( i1 INTEGER NOT NULL, c1 VARCHAR(1) NOT NULL ) ENGINE=InnoDB; INSERT INTO t1 VALUES (2,'w'); CREATE TABLE t2 ( i1 INTEGER NOT NULL, c1 VARCHAR(1) NOT NULL, c2 VARCHAR(1) NOT NULL, KEY (c1, i1) ) ENGINE=InnoDB; INSERT INTO t2 VALUES (8,'d','d'); INSERT INTO t2 VALUES (4,'v','v'); CREATE TABLE t3 ( c1 VARCHAR(1) NOT NULL ) ENGINE=InnoDB; INSERT INTO t3 VALUES ('v'); EXPLAIN FORMAT=json SELECT i1 FROM t1 WHERE EXISTS (SELECT t2.c1 FROM (t2 INNER JOIN t3 ON (t3.c1 = t2.c1)) WHERE t2.c2 != t1.c1 AND t2.c2 = (SELECT MIN(t3.c1) FROM t3)); DROP TABLE t1, t2, t3; --echo # multiple materialization groups CREATE TABLE t1 (c_key INT, KEY c_key (c_key)); INSERT INTO t1 VALUES (1), (2), (3); CREATE TABLE t2 (c INT, c_key INT); INSERT INTO t2 VALUES (8,5),(4,5),(8,1); CREATE TABLE t3 LIKE t1; INSERT INTO t3 SELECT * FROM t1; CREATE TABLE t4 LIKE t2; INSERT INTO t4 SELECT * FROM t2; CREATE TABLE t5 (c INT); INSERT INTO t5 VALUES (1), (2), (3); --echo # This should show two materialization groups where applicable let $query=SELECT * FROM t5 WHERE c IN (SELECT t2.c FROM t1 JOIN t2 ON t2.c_key = t1.c_key) AND c IN (SELECT t4.c FROM t3 JOIN t4 ON t4.c_key = t3.c_key); --eval EXPLAIN $query --eval EXPLAIN FORMAT=JSON $query DROP TABLE t1, t2, t3, t4, t5; CREATE TABLE t1 (i INT); CREATE TABLE t2 (i INT); CREATE TABLE t3 (i INT); INSERT INTO t1 VALUES (1); INSERT INTO t2 VALUES (1); INSERT INTO t3 VALUES (1); --echo # Subqueries in UPDATE values list let $query=UPDATE t1 SET i=(SELECT i FROM t2); --eval EXPLAIN $query --eval EXPLAIN FORMAT=JSON $query let $query=UPDATE t1, t2 SET t1.i=(SELECT i FROM t3); --eval EXPLAIN $query --eval EXPLAIN FORMAT=JSON $query --echo # INSERT ... ON DUPLICATE KEY UPDATE x=(SELECT ...) value list let $query=INSERT INTO t1 (i) SELECT i FROM t2 ON DUPLICATE KEY UPDATE i=(SELECT i FROM t2); --eval EXPLAIN $query --eval EXPLAIN FORMAT=JSON $query let $query=INSERT INTO t1 VALUES (1) ON DUPLICATE KEY UPDATE i = (SELECT i FROM t2); --eval EXPLAIN $query --eval EXPLAIN FORMAT=JSON $query --echo # Subqueries in INSERT VALUES tuples: let $query=INSERT INTO t3 VALUES((SELECT i FROM t1)), ((SELECT i FROM t2)); --eval EXPLAIN $query --eval EXPLAIN FORMAT=JSON $query DROP TABLE t1, t2, t3; --echo # Various queries let $query= SELECT a, b FROM (SELECT 1 AS a, 2 AS b UNION ALL SELECT 1 AS a, 2 AS b) t1 GROUP BY a ORDER BY b DESC; --eval EXPLAIN $query --eval EXPLAIN FORMAT=JSON $query --echo # CREATE TABLE t1(a INT, b INT); INSERT INTO t1 VALUES (), (); let $query=SELECT 1 FROM t1 GROUP BY GREATEST(t1.a, (SELECT 1 FROM (SELECT t1.b FROM t1, t1 t2 ORDER BY t1.a, t1.a LIMIT 1) AS d)); --eval EXPLAIN $query --eval EXPLAIN FORMAT=JSON $query DROP TABLE t1; --echo # CREATE TABLE t1(f1 INT); INSERT INTO t1 VALUES (1),(1); let $query=SELECT 1 FROM t1 WHERE (SELECT (SELECT 1 FROM t1 GROUP BY f1)); --eval EXPLAIN $query --eval EXPLAIN FORMAT=JSON $query DROP TABLE t1; --echo # CREATE TABLE t1 (i INT); CREATE TABLE t2 (i INT, j INT); INSERT INTO t1 VALUES (1), (2), (3), (4), (5), (6), (7), (8), (9), (10); INSERT INTO t2 SELECT i, i * 10 FROM t1; let $query=SELECT * FROM t1 ORDER BY (SELECT t2.j FROM t2 WHERE t2.i = t1.i); --eval EXPLAIN $query --eval EXPLAIN FORMAT=JSON $query let $query=SELECT * FROM t1 GROUP BY (SELECT t2.j FROM t2 WHERE t2.i = t1.i); --eval EXPLAIN $query --eval EXPLAIN FORMAT=JSON $query DROP TABLE t1, t2; CREATE TABLE t1 (a INT NOT NULL, b INT NOT NULL, PRIMARY KEY(a, b)); INSERT INTO t1 VALUES (10,1),(10,2),(10,3),(20,4),(20,5),(20,6), (30,7),(30,8),(30,9),(40,10),(40,11),(40,12),(40,13); EXPLAIN FORMAT=JSON SELECT a, MIN(b) AS b FROM t1 GROUP BY a ORDER BY b; DROP TABLE t1; --echo # CREATE TABLE t1 (a INT NOT NULL, b CHAR(3) NOT NULL, PRIMARY KEY (a)); INSERT INTO t1 VALUES (1,'ABC'), (2,'EFG'), (3,'HIJ'); CREATE TABLE t2 (a INT NOT NULL,b CHAR(3) NOT NULL,PRIMARY KEY (a, b)); INSERT INTO t2 VALUES (1,'a'),(1,'b'),(3,'F'); EXPLAIN FORMAT=JSON SELECT t1.a, GROUP_CONCAT(t2.b) AS b FROM t1 LEFT JOIN t2 ON t1.a=t2.a GROUP BY t1.a ORDER BY t1.b; DROP TABLE t1; DROP TABLE t2; --echo # CREATE TABLE t1 (a INT, b INT); INSERT INTO t1 VALUES (1,4), (2,2), (2,2), (4,1), (4,1), (4,1), (4,1), (2,1), (2,1); EXPLAIN FORMAT=JSON SELECT SUM(b) FROM t1 GROUP BY a WITH ROLLUP; DROP TABLE t1; --echo # Composition of DISTINCT, GROUP BY and ORDER BY CREATE TABLE t1 (a INT, b INT); INSERT INTO t1 VALUES (1, 1), (1, 2), (2, 1), (2, 2), (3, 1); let $query=SELECT DISTINCT SUM(b) s FROM t1 GROUP BY a ORDER BY s; --eval EXPLAIN FORMAT=JSON $query FLUSH STATUS; --eval $query SHOW SESSION STATUS WHERE (Variable_name LIKE 'Sort_%' OR Variable_name LIKE 'Created_%_tables') AND Value > 0; DROP TABLE t1; --echo # "buffer_result" node CREATE TABLE t1 (a INT NOT NULL); CREATE TABLE t2 (a INT NOT NULL, PRIMARY KEY (a)); INSERT INTO t1 VALUES (1); INSERT INTO t2 VALUES (1),(2); EXPLAIN FORMAT=JSON SELECT SQL_BIG_RESULT DISTINCT t1.a FROM t1,t2 ORDER BY t2.a; DROP TABLE t1, t2; --echo # CREATE TABLE t1 (a INT NOT NULL, b INT, PRIMARY KEY (a)); CREATE TABLE t2 (a INT NOT NULL, PRIMARY KEY (a)); INSERT INTO t1 VALUES (1,10), (2,20), (3,30), (4,40); INSERT INTO t2 VALUES (2), (3), (4), (5); EXPLAIN FORMAT=JSON SELECT * FROM t2 WHERE t2.a IN (SELECT a FROM t1 WHERE t1.b <> 30); DROP TABLE t1, t2; set default_storage_engine= @save_storage_engine;