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313 lines
6.8 KiB
Plaintext
313 lines
6.8 KiB
Plaintext
#
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# MDEV-25080: Allow pushdown of queries involving UNIONs
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# in outer select to foreign engines
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CREATE USER IF NOT EXISTS'cejuser'@'localhost' IDENTIFIED BY 'Vagrant1|0000001';
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GRANT ALL PRIVILEGES ON *.* TO 'cejuser'@'localhost';
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FLUSH PRIVILEGES;
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DROP DATABASE IF EXISTS mdev25080;
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CREATE DATABASE mdev25080;
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USE mdev25080;
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CREATE TABLE t1 (a varchar(30)) ENGINE=ColumnStore;
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CREATE TABLE t2 (a varchar(30)) ENGINE=ColumnStore;
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CREATE TABLE t3 (a varchar(30)) ENGINE=MyISAM;
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CREATE TABLE t4 (a varchar(30)) ENGINE=MyISAM;
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INSERT INTO t1 VALUES ('abc'), ('bcd'), ('cde');
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INSERT INTO t2 VALUES ('bcd'), ('cde'), ('def'), ('efg');
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INSERT INTO t3 VALUES ('t3_myisam1'), ('t3_myisam2'), ('t3_myisam3');
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INSERT INTO t4 VALUES ('t4_myisam1'), ('t4_myisam2'), ('t4_myisam3');
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# Pushdown of the whole UNION
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SELECT * FROM t1 UNION SELECT * FROM t2 ORDER BY 1;
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a
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abc
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bcd
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cde
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def
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efg
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EXPLAIN SELECT * FROM t1 UNION SELECT * FROM t2 ORDER BY 1;
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id select_type table type possible_keys key key_len ref rows Extra
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NULL PUSHED UNION NULL NULL NULL NULL NULL NULL NULL NULL
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SELECT * FROM t1 UNION ALL SELECT * FROM t2 ORDER BY 1;
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a
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abc
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bcd
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bcd
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cde
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cde
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def
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efg
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EXPLAIN SELECT * FROM t1 UNION ALL SELECT * FROM t2 ORDER BY 1;
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id select_type table type possible_keys key key_len ref rows Extra
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NULL PUSHED UNION NULL NULL NULL NULL NULL NULL NULL NULL
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# UNION with a foreign engine
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SELECT * FROM t1 UNION SELECT * FROM t3 ORDER BY 1;
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a
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abc
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bcd
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cde
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t3_myisam1
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t3_myisam2
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t3_myisam3
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EXPLAIN SELECT * FROM t1 UNION SELECT * FROM t3 ORDER BY 1;
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id select_type table type possible_keys key key_len ref rows Extra
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NULL PUSHED UNION NULL NULL NULL NULL NULL NULL NULL NULL
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# More than two SELECTs in a UNIT:
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SELECT * FROM t1 UNION
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SELECT * FROM t2 UNION ALL
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SELECT * FROM t1
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ORDER BY 1;
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a
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abc
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abc
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bcd
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bcd
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cde
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cde
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def
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efg
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EXPLAIN SELECT * FROM t1 UNION
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SELECT * FROM t2 UNION ALL
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SELECT * FROM t1
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ORDER BY 1;
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id select_type table type possible_keys key key_len ref rows Extra
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NULL PUSHED UNION NULL NULL NULL NULL NULL NULL NULL NULL
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(SELECT * FROM t1 UNION
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SELECT * FROM t2) UNION ALL
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SELECT * FROM t1
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ORDER BY 1;
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a
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abc
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abc
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bcd
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bcd
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cde
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cde
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def
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efg
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EXPLAIN (SELECT * FROM t1 UNION
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SELECT * FROM t2) UNION ALL
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SELECT * FROM t1
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ORDER BY 1;
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id select_type table type possible_keys key key_len ref rows Extra
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NULL PUSHED UNION NULL NULL NULL NULL NULL NULL NULL NULL
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SELECT * FROM t1 UNION
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SELECT * FROM t2 UNION ALL
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SELECT * FROM t3 UNION
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SELECT * FROM t4
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ORDER BY 1;
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a
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abc
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bcd
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cde
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def
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efg
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t3_myisam1
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t3_myisam2
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t3_myisam3
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t4_myisam1
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t4_myisam2
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t4_myisam3
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EXPLAIN SELECT * FROM t1 UNION
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SELECT * FROM t2 UNION ALL
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SELECT * FROM t3 UNION
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SELECT * FROM t4
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ORDER BY 1;
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id select_type table type possible_keys key key_len ref rows Extra
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NULL PUSHED UNION NULL NULL NULL NULL NULL NULL NULL NULL
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(SELECT * FROM t1 UNION
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SELECT * FROM t2) UNION ALL
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(SELECT * FROM t3 UNION
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SELECT * FROM t4)
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ORDER BY 1;
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a
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abc
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bcd
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cde
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def
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efg
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t3_myisam1
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t3_myisam2
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t3_myisam3
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t4_myisam1
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t4_myisam2
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t4_myisam3
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EXPLAIN (SELECT * FROM t1 UNION
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SELECT * FROM t2) UNION ALL
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(SELECT * FROM t3 UNION
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SELECT * FROM t4)
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ORDER BY 1;
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id select_type table type possible_keys key key_len ref rows Extra
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NULL PUSHED UNION NULL NULL NULL NULL NULL NULL NULL NULL
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SELECT count(*) FROM t1 UNION
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SELECT count(*) FROM t2 UNION ALL
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SELECT count(*)+20 FROM t2 UNION
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SELECT count(*)+5 FROM t1
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ORDER BY 1;
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count(*)
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3
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4
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8
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24
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EXPLAIN
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SELECT count(*) FROM t1 UNION
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SELECT count(*) FROM t2 UNION ALL
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SELECT count(*)+20 FROM t2 UNION
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SELECT count(*)+5 FROM t1
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ORDER BY 1;
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id select_type table type possible_keys key key_len ref rows Extra
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NULL PUSHED UNION NULL NULL NULL NULL NULL NULL NULL NULL
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# UNION inside a derived table: the whole derived table must be pushed
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SELECT a FROM
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(SELECT a FROM t1 UNION ALL SELECT a FROM t2) q ORDER BY a;
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a
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abc
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bcd
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bcd
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cde
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cde
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def
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efg
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EXPLAIN
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SELECT a FROM
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(SELECT a FROM t1 UNION ALL SELECT a FROM t2) q ORDER BY a;
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id select_type table type possible_keys key key_len ref rows Extra
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1 PUSHED SELECT NULL NULL NULL NULL NULL NULL NULL NULL
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SELECT a FROM
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(SELECT a FROM t1 UNION ALL SELECT a FROM t3) q ORDER BY a;
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a
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abc
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bcd
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cde
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t3_myisam1
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t3_myisam2
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t3_myisam3
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EXPLAIN
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SELECT a FROM
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(SELECT a FROM t1 UNION ALL SELECT a FROM t3) q ORDER BY a;
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id select_type table type possible_keys key key_len ref rows Extra
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1 PUSHED SELECT NULL NULL NULL NULL NULL NULL NULL NULL
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# Prepared statements
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PREPARE stmt FROM "SELECT * FROM t1 UNION
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SELECT * FROM t2 ORDER BY 1";
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EXECUTE stmt;
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a
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abc
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bcd
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cde
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def
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efg
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EXECUTE stmt;
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a
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abc
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bcd
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cde
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def
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efg
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EXECUTE stmt;
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a
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abc
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bcd
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cde
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def
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efg
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PREPARE stmt FROM "EXPLAIN SELECT * FROM t1 UNION
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SELECT * FROM t2 ORDER BY 1";
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EXECUTE stmt;
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id select_type table type possible_keys key key_len ref rows Extra
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NULL PUSHED UNION NULL NULL NULL NULL NULL NULL NULL NULL
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EXECUTE stmt;
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id select_type table type possible_keys key key_len ref rows Extra
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NULL PUSHED UNION NULL NULL NULL NULL NULL NULL NULL NULL
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PREPARE stmt FROM "(SELECT * FROM t1 UNION
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SELECT * FROM t2) UNION ALL
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(SELECT * FROM t1 UNION
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SELECT * FROM t2) ORDER BY 1";
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EXECUTE stmt;
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a
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abc
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abc
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bcd
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bcd
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cde
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cde
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def
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def
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efg
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efg
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EXECUTE stmt;
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a
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abc
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abc
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bcd
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bcd
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cde
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cde
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def
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def
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efg
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efg
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EXECUTE stmt;
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a
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abc
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abc
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bcd
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bcd
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cde
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cde
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def
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def
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efg
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efg
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PREPARE stmt FROM "EXPLAIN (SELECT * FROM t1 UNION
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SELECT * FROM t2) UNION ALL
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(SELECT * FROM t1 UNION
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SELECT * FROM t2) ORDER BY 1";
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EXECUTE stmt;
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id select_type table type possible_keys key key_len ref rows Extra
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NULL PUSHED UNION NULL NULL NULL NULL NULL NULL NULL NULL
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EXECUTE stmt;
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id select_type table type possible_keys key key_len ref rows Extra
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NULL PUSHED UNION NULL NULL NULL NULL NULL NULL NULL NULL
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# MCOL-5432 Disable UNION pushdown if an ORDER BY or a LIMIT
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# clause is involved, until MCOL-5222 is fixed.
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SELECT * FROM t1 UNION ALL SELECT * FROM t2 ORDER BY a;
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a
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abc
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bcd
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bcd
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cde
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cde
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def
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efg
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EXPLAIN SELECT * FROM t1 UNION ALL SELECT * FROM t2 ORDER BY a;
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id select_type table type possible_keys key key_len ref rows Extra
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NULL PUSHED UNION NULL NULL NULL NULL NULL NULL NULL NULL
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SELECT * FROM t1 UNION ALL SELECT * FROM t2 ORDER BY a LIMIT 3;
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a
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abc
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bcd
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bcd
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EXPLAIN SELECT * FROM t1 UNION ALL SELECT * FROM t2 ORDER BY a LIMIT 3;
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id select_type table type possible_keys key key_len ref rows Extra
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NULL PUSHED UNION NULL NULL NULL NULL NULL NULL NULL NULL
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SELECT * FROM t1 UNION ALL SELECT * FROM t2 ORDER BY a DESC LIMIT 5;
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a
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efg
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def
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cde
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cde
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bcd
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EXPLAIN SELECT * FROM t1 UNION ALL SELECT * FROM t2 ORDER BY a DESC LIMIT 5;
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id select_type table type possible_keys key key_len ref rows Extra
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NULL PUSHED UNION NULL NULL NULL NULL NULL NULL NULL NULL
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SELECT * FROM t1 UNION ALL SELECT * FROM t2 ORDER BY a LIMIT 3 OFFSET 2;
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a
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bcd
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cde
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cde
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EXPLAIN SELECT * FROM t1 UNION ALL SELECT * FROM t2 ORDER BY a LIMIT 3 OFFSET 2;
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id select_type table type possible_keys key key_len ref rows Extra
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NULL PUSHED UNION NULL NULL NULL NULL NULL NULL NULL NULL
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DROP USER 'cejuser'@'localhost';
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DROP TABLE t1, t2, t3, t4;
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DROP DATABASE mdev25080;
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