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Fixed bug #16081: row equalities were not taken into
account by the optimizer. Now all row equalities are converted into conjunctions of equalities between row elements. They are taken into account by the optimizer together with the original regular equality predicates. mysql-test/r/join_outer.result: Adjusted results after fix for bug #16081. mysql-test/r/row.result: Added a test cases for bug #16081. mysql-test/t/row.test: Added a test cases for bug #16081. sql/sql_list.h: Corrected the copy constructor for the class base_list. The previous implementation resulted in creation of an inconsistent base_list if the source list was empty.
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@@ -181,3 +181,128 @@ SELECT ROW(1,1,1) = ROW(1,1,1) as `1`, ROW(1,1,1) = ROW(1,2,1) as `0`, ROW(1,NUL
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select row(NULL,1)=(2,0);
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row(NULL,1)=(2,0)
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0
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CREATE TABLE t1 (a int, b int, PRIMARY KEY (a,b));
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INSERT INTO t1 VALUES (1,1), (2,1), (3,1), (1,2), (3,2), (3,3);
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EXPLAIN SELECT * FROM t1 WHERE a=3 AND b=2;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 const PRIMARY PRIMARY 8 const,const 1 Using index
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EXPLAIN SELECT * FROM t1 WHERE (a,b)=(3,2);
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 const PRIMARY PRIMARY 8 const,const 1 Using index
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SELECT * FROM t1 WHERE a=3 and b=2;
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a b
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3 2
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SELECT * FROM t1 WHERE (a,b)=(3,2);
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a b
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3 2
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CREATE TABLE t2 (a int, b int, c int, PRIMARY KEY (a,b,c));
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INSERT INTO t2 VALUES
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(1,1,2), (3,1,3), (1,2,2), (4,4,2),
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(1,1,1), (3,1,1), (1,2,1);
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EXPLAIN SELECT * FROM t1,t2 WHERE t1.a=t2.a AND t1.b=t2.b;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index PRIMARY PRIMARY 8 NULL 6 Using index
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1 SIMPLE t2 ref PRIMARY PRIMARY 8 test.t1.a,test.t1.b 1 Using index
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EXPLAIN SELECT * FROM t1,t2 WHERE (t1.a,t1.b)=(t2.a,t2.b);
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index PRIMARY PRIMARY 8 NULL 6 Using index
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1 SIMPLE t2 ref PRIMARY PRIMARY 8 test.t1.a,test.t1.b 1 Using index
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SELECT * FROM t1,t2 WHERE t1.a=t2.a and t1.b=t2.b;
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a b a b c
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1 1 1 1 1
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1 1 1 1 2
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1 2 1 2 1
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1 2 1 2 2
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3 1 3 1 1
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3 1 3 1 3
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SELECT * FROM t1,t2 WHERE (t1.a,t1.b)=(t2.a,t2.b);
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a b a b c
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1 1 1 1 1
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1 1 1 1 2
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1 2 1 2 1
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1 2 1 2 2
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3 1 3 1 1
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3 1 3 1 3
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EXPLAIN SELECT * FROM t1,t2 WHERE t1.a=t2.a AND t1.b=2;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index PRIMARY PRIMARY 8 NULL 5 Using where; Using index
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1 SIMPLE t2 ref PRIMARY PRIMARY 4 test.t1.a 1 Using index
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EXPLAIN SELECT * FROM t1,t2 WHERE (t1.a,t1.b)=(t2.a,2);
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index PRIMARY PRIMARY 8 NULL 5 Using where; Using index
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1 SIMPLE t2 ref PRIMARY PRIMARY 4 test.t1.a 1 Using index
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SELECT * FROM t1,t2 WHERE t1.a=1 and t1.b=t2.b;
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a b a b c
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1 1 1 1 2
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1 1 3 1 3
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1 2 1 2 2
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1 1 1 1 1
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1 1 3 1 1
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1 2 1 2 1
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SELECT * FROM t1,t2 WHERE (t1.a,t1.b)=(t2.a,2);
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a b a b c
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1 2 1 1 1
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1 2 1 1 2
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1 2 1 2 1
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1 2 1 2 2
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3 2 3 1 1
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3 2 3 1 3
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EXPLAIN EXTENDED SELECT * FROM t1,t2 WHERE (t1.a,t1.b)=(t2.a,t2.b+1);
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index PRIMARY PRIMARY 8 NULL 6 Using index
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1 SIMPLE t2 ref PRIMARY PRIMARY 4 test.t1.a 1 Using where; Using index
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Warnings:
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Note 1003 select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`c` AS `c` from `test`.`t1` join `test`.`t2` where ((`test`.`t2`.`a` = `test`.`t1`.`a`) and (`test`.`t1`.`b` = (`test`.`t2`.`b` + 1)))
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SELECT * FROM t1,t2 WHERE (t1.a,t1.b)=(t2.a,t2.b+1);
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a b a b c
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1 2 1 1 1
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1 2 1 1 2
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3 2 3 1 1
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3 2 3 1 3
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EXPLAIN EXTENDED SELECT * FROM t1,t2 WHERE (t1.a-1,t1.b)=(t2.a-1,t2.b+1);
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index NULL PRIMARY 8 NULL 6 Using index
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1 SIMPLE t2 index NULL PRIMARY 12 NULL 7 Using where; Using index
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Warnings:
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Note 1003 select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`c` AS `c` from `test`.`t1` join `test`.`t2` where (((`test`.`t1`.`a` - 1) = (`test`.`t2`.`a` - 1)) and (`test`.`t1`.`b` = (`test`.`t2`.`b` + 1)))
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SELECT * FROM t1,t2 WHERE (t1.a-1,t1.b)=(t2.a-1,t2.b+1);
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a b a b c
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1 2 1 1 2
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3 2 3 1 3
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1 2 1 1 1
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3 2 3 1 1
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EXPLAIN SELECT * FROM t2 WHERE a=3 AND b=2;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 ref PRIMARY PRIMARY 8 const,const 1 Using index
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EXPLAIN SELECT * FROM t2 WHERE (a,b)=(3,2);
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 ref PRIMARY PRIMARY 8 const,const 1 Using index
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SELECT * FROM t2 WHERE a=3 and b=2;
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a b c
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SELECT * FROM t2 WHERE (a,b)=(3,2);
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a b c
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EXPLAIN SELECT * FROM t1,t2 WHERE t2.a=t1.a AND t2.b=2 AND t2.c=1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index PRIMARY PRIMARY 8 NULL 6 Using index
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1 SIMPLE t2 eq_ref PRIMARY PRIMARY 12 test.t1.a,const,const 1 Using index
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EXPLAIN EXTENDED SELECT * FROM t1,t2 WHERE (t2.a,(t2.b,t2.c))=(t1.a,(2,1));
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index PRIMARY PRIMARY 8 NULL 6 Using index
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1 SIMPLE t2 eq_ref PRIMARY PRIMARY 12 test.t1.a,const,const 1 Using index
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Warnings:
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Note 1003 select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`c` AS `c` from `test`.`t1` join `test`.`t2` where ((`test`.`t2`.`c` = 1) and (`test`.`t2`.`b` = 2) and (`test`.`t2`.`a` = `test`.`t1`.`a`))
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SELECT * FROM t1,t2 WHERE (t2.a,(t2.b,t2.c))=(t1.a,(2,1));
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a b a b c
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1 1 1 2 1
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1 2 1 2 1
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EXPLAIN EXTENDED SELECT * FROM t1,t2 WHERE t2.a=t1.a AND (t2.b,t2.c)=(2,1);
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index PRIMARY PRIMARY 8 NULL 6 Using index
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1 SIMPLE t2 eq_ref PRIMARY PRIMARY 12 test.t1.a,const,const 1 Using index
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Warnings:
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Note 1003 select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`c` AS `c` from `test`.`t1` join `test`.`t2` where ((`test`.`t2`.`c` = 1) and (`test`.`t2`.`b` = 2) and (`test`.`t2`.`a` = `test`.`t1`.`a`))
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SELECT * FROM t1,t2 WHERE t2.a=t1.a AND (t2.b,t2.c)=(2,1);
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a b a b c
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1 1 1 2 1
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1 2 1 2 1
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DROP TABLE t1,t2;
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