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c9b63e6a49
The wrong result set returned by the left join query from the bug test case happened due to several inconsistencies and bugs of the legacy mysql code. The bug test case uses an execution plan that employs a scan of a materialized IN subquery from the WHERE condition. When materializing such an IN- subquery the optimizer injects additional equalities into the WHERE clause. These equalities express the constraints imposed by the subquery predicate. The injected equality of the query in the test case happens to belong to the same equality class, and a new equality imposing a condition on the rows of the materialized subquery is inferred from this class. Simultaneously the multiple equality is added to the ON expression of the LEFT JOIN used in the main query. The inferred equality of the form f1=f2 is taken into account when optimizing the scan of the rows the temporary table that is the result of the subquery materialization: only the values of the field f1 are read from the table into the record buffer. Meanwhile the inferred equality is removed from the WHERE conditions altogether as a constraint on the fields of the temporary table that has been used when filling this table. This equality is supposed to be removed from the ON expression when the multiple equalities of the ON expression are converted into an optimal set of equality predicates. It supposed to be removed from the ON expression as an equality inferred from only equalities of the WHERE condition. Yet, it did not happened due to the following bug in the code. Erroneously the code tried to build multiple equality for ON expression twice: the first time, when it called optimize_cond() for the WHERE condition, the second time, when it called this function for the HAVING condition. When executing optimize_con() for the WHERE condition a reference to the multiple equality of the WHERE condition is set in the multiple equality of the ON expression. This reference would allow later to convert multiple equalities of the ON expression into equality predicates. However the the second call of build_equal_items() for the ON expression that happened when optimize_cond() was called for the HAVING condition reset this reference to NULL. This bug fix blocks calling build_equal_items() for ON expressions for the second time. In general, it will be beneficial for many queries as it removes from ON expressions any equalities that are to be checked for the WHERE condition. The patch also fixes two bugs in the list manipulation operations and a bug in the function substitute_for_best_equal_field() that resulted in passing wrong reference to the multiple equalities of where conditions when processing multiple equalities of ON expressions. The code of substitute_for_best_equal_field() and the code the helper function eliminate_item_equal() were also streamlined and cleaned up. Now the conversion of the multiple equalities into an optimal set of equality predicates first produces the sequence of the all equalities processing multiple equalities one by one, and, only after this, it inserts the equalities at the beginning of the other conditions. The multiple changes in the output of EXPLAIN EXTENDED are mainly the result of this streamlining, but in some cases is the result of the removal of unneeded equalities from ON expressions. In some test cases this removal were reflected in the output of EXPLAIN resulted in disappearance of “Using where” in some rows of the execution plans.
491 lines
16 KiB
Text
491 lines
16 KiB
Text
drop table if exists t1;
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select (1,2,3) IN ((3,2,3), (1,2,3), (1,3,3));
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(1,2,3) IN ((3,2,3), (1,2,3), (1,3,3))
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1
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select row(10,2,3) IN (row(3,2,3), row(1,2,3), row(1,3,3));
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row(10,2,3) IN (row(3,2,3), row(1,2,3), row(1,3,3))
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0
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select row(1,2,3) IN (row(3,NULL,3), row(1,2,3), row(1,3,3));
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row(1,2,3) IN (row(3,NULL,3), row(1,2,3), row(1,3,3))
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1
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select row(10,2,3) IN (row(3,NULL,3), row(1,2,3), row(1,3,3));
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row(10,2,3) IN (row(3,NULL,3), row(1,2,3), row(1,3,3))
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0
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select row('a',1.5,3) IN (row(1,2,3), row('a',1.5,3), row('a','a','a'));
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row('a',1.5,3) IN (row(1,2,3), row('a',1.5,3), row('a','a','a'))
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1
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Warnings:
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Warning 1292 Truncated incorrect DECIMAL value: 'a'
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Warning 1292 Truncated incorrect INTEGER value: 'a'
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select row('a',0,3) IN (row(3,2,3), row('a','a','3'), row(1,3,3));
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row('a',0,3) IN (row(3,2,3), row('a','a','3'), row(1,3,3))
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1
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Warnings:
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Warning 1292 Truncated incorrect INTEGER value: 'a'
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select row('a',0,3) IN (row(3,2,3), row('a','0','3'), row(1,3,3));
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row('a',0,3) IN (row(3,2,3), row('a','0','3'), row(1,3,3))
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1
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select row('a',1.5,3) IN (row(3,NULL,3), row('a',1.5,3), row(1,3,3));
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row('a',1.5,3) IN (row(3,NULL,3), row('a',1.5,3), row(1,3,3))
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1
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select row('b',1.5,3) IN (row(3,NULL,3), row('a',1.5,3), row(1,3,3));
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row('b',1.5,3) IN (row(3,NULL,3), row('a',1.5,3), row(1,3,3))
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0
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select row('b',1.5,3) IN (row('b',NULL,3), row('a',1.5,3), row(1,3,3));
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row('b',1.5,3) IN (row('b',NULL,3), row('a',1.5,3), row(1,3,3))
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NULL
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select row('b',1.5,3) IN (row('b',NULL,4), row('a',1.5,3), row(1,3,3));
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row('b',1.5,3) IN (row('b',NULL,4), row('a',1.5,3), row(1,3,3))
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0
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select (1,2,(3,4)) IN ((3,2,(3,4)), (1,2,(3,4)));
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(1,2,(3,4)) IN ((3,2,(3,4)), (1,2,(3,4)))
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1
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select row(1,2,row(3,4)) IN (row(3,2,row(3,4)), row(1,2,4));
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ERROR 21000: Operand should contain 2 column(s)
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select row(1,2,row(3,4)) IN (row(3,2,row(3,4)), row(1,2,row(3,NULL)));
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row(1,2,row(3,4)) IN (row(3,2,row(3,4)), row(1,2,row(3,NULL)))
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NULL
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explain extended select row(1,2,row(3,4)) IN (row(3,2,row(3,4)), row(1,2,row(3,NULL)));
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL No tables used
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Warnings:
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Note 1003 select ((1,2,(3,4)) in ((3,2,(3,4)),(1,2,(3,NULL)))) AS `row(1,2,row(3,4)) IN (row(3,2,row(3,4)), row(1,2,row(3,NULL)))`
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SELECT (1,2,3)=(0,NULL,3);
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(1,2,3)=(0,NULL,3)
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0
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SELECT (1,2,3)=(1,NULL,3);
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(1,2,3)=(1,NULL,3)
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NULL
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SELECT (1,2,3)=(1,NULL,0);
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(1,2,3)=(1,NULL,0)
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0
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SELECT ROW(1,2,3)=ROW(1,2,3);
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ROW(1,2,3)=ROW(1,2,3)
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1
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SELECT ROW(2,2,3)=ROW(1+1,2,3);
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ROW(2,2,3)=ROW(1+1,2,3)
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1
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SELECT ROW(1,2,3)=ROW(1+1,2,3);
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ROW(1,2,3)=ROW(1+1,2,3)
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0
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SELECT ROW(1,2,3)<ROW(1+1,2,3);
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ROW(1,2,3)<ROW(1+1,2,3)
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1
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SELECT ROW(1,2,3)>ROW(1+1,2,3);
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ROW(1,2,3)>ROW(1+1,2,3)
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0
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SELECT ROW(1,2,3)<=ROW(1+1,2,3);
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ROW(1,2,3)<=ROW(1+1,2,3)
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1
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SELECT ROW(1,2,3)>=ROW(1+1,2,3);
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ROW(1,2,3)>=ROW(1+1,2,3)
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0
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SELECT ROW(1,2,3)<>ROW(1+1,2,3);
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ROW(1,2,3)<>ROW(1+1,2,3)
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1
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SELECT ROW(NULL,2,3)=ROW(NULL,2,3);
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ROW(NULL,2,3)=ROW(NULL,2,3)
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NULL
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SELECT ROW(NULL,2,3)<=>ROW(NULL,2,3);
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ROW(NULL,2,3)<=>ROW(NULL,2,3)
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1
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SELECT ROW(1,2,ROW(3,4,5))=ROW(1,2,ROW(3,4,5));
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ROW(1,2,ROW(3,4,5))=ROW(1,2,ROW(3,4,5))
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1
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SELECT ROW('test',2,3.33)=ROW('test',2,3.33);
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ROW('test',2,3.33)=ROW('test',2,3.33)
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1
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SELECT ROW('test',2,3.33)=ROW('test',2,3.33,4);
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ERROR 21000: Operand should contain 3 column(s)
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SELECT ROW('test',2,ROW(3,33))=ROW('test',2,ROW(3,33));
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ROW('test',2,ROW(3,33))=ROW('test',2,ROW(3,33))
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1
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SELECT ROW('test',2,ROW(3,33))=ROW('test',2,ROW(3,3));
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ROW('test',2,ROW(3,33))=ROW('test',2,ROW(3,3))
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0
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SELECT ROW('test',2,ROW(3,33))=ROW('test',2,ROW(3,NULL));
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ROW('test',2,ROW(3,33))=ROW('test',2,ROW(3,NULL))
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NULL
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SELECT ROW('test',2,ROW(3,33))=ROW('test',2,4);
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ERROR 21000: Operand should contain 2 column(s)
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create table t1 ( a int, b int, c int);
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insert into t1 values (1,2,3), (2,3,1), (3,2,1), (1,2,NULL);
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select * from t1 where ROW(1,2,3)=ROW(a,b,c);
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a b c
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1 2 3
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select * from t1 where ROW(0,2,3)=ROW(a,b,c);
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a b c
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select * from t1 where ROW(1,2,3)<ROW(a,b,c);
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a b c
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2 3 1
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3 2 1
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select ROW(a,2,3) IN(row(1,b,c), row(2,3,1)) from t1;
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ROW(a,2,3) IN(row(1,b,c), row(2,3,1))
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1
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0
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0
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NULL
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select ROW(c,2,3) IN(row(1,b,a), row(2,3,1)) from t1;
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ROW(c,2,3) IN(row(1,b,a), row(2,3,1))
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0
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0
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1
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NULL
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select ROW(a,b,c) IN(row(1,2,3), row(3,2,1)) from t1;
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ROW(a,b,c) IN(row(1,2,3), row(3,2,1))
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1
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0
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1
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NULL
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select ROW(1,2,3) IN(row(a,b,c), row(1,2,3)) from t1;
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ROW(1,2,3) IN(row(a,b,c), row(1,2,3))
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1
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1
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1
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1
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drop table t1;
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select ROW(1,1);
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ERROR 21000: Operand should contain 1 column(s)
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create table t1 (i int);
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select 1 from t1 where ROW(1,1);
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ERROR 21000: Operand should contain 1 column(s)
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select count(*) from t1 order by ROW(1,1);
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ERROR 21000: Operand should contain 1 column(s)
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select count(*) from t1 having (1,1) order by i;
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ERROR 21000: Operand should contain 1 column(s)
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drop table t1;
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create table t1 (a int, b int);
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insert into t1 values (1, 4);
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insert into t1 values (10, 40);
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insert into t1 values (1, 4);
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insert into t1 values (10, 43);
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insert into t1 values (1, 4);
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insert into t1 values (10, 41);
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insert into t1 values (1, 4);
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insert into t1 values (10, 43);
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insert into t1 values (1, 4);
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select a, MAX(b), (1, MAX(b)) = (1, 4) from t1 group by a;
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a MAX(b) (1, MAX(b)) = (1, 4)
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1 4 1
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10 43 0
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drop table t1;
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SELECT ROW(2,10) <=> ROW(3,4);
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ROW(2,10) <=> ROW(3,4)
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0
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SELECT ROW(NULL,10) <=> ROW(3,NULL);
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ROW(NULL,10) <=> ROW(3,NULL)
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0
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SELECT ROW(1,ROW(2,3)) IN (ROW(1,ROW(2,3)),ROW(1,1));
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ERROR 21000: Operand should contain 2 column(s)
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SELECT ROW(1,ROW(2,3)) IN (ROW(1,ROW(2,3)),ROW(1,1),ROW(1,ROW(2,3)));
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ERROR 21000: Operand should contain 2 column(s)
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SELECT ROW(1,ROW(2,3)) IN (ROW(1,ROW(2,3)),ROW(1,ROW(2,2,2)));
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ERROR 21000: Operand should contain 2 column(s)
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SELECT ROW(1,ROW(2,3,4)) IN (ROW(1,ROW(2,3,4)),ROW(1,ROW(2,2)));
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ERROR 21000: Operand should contain 3 column(s)
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SELECT ROW(1,ROW(2,3)) IN (ROW(1,ROW(2,3)),(SELECT 1,1));
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ERROR 21000: Operand should contain 2 column(s)
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SELECT ROW(1,ROW(2,3)) IN (ROW(1,ROW(2,3)),(SELECT 1,1),ROW(1,ROW(2,4)));
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ERROR 21000: Operand should contain 2 column(s)
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SELECT ROW(1,ROW(2,3)) IN ((SELECT 1,1),ROW(1,ROW(2,3)));
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ERROR 21000: Operand should contain 2 column(s)
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SELECT ROW(2,1) IN (ROW(21,2),ROW(ROW(1,1,3),0));
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ERROR 21000: Operand should contain 1 column(s)
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SELECT ROW(2,1) IN (ROW(ROW(1,1,3),0),ROW(21,2));
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ERROR 21000: Operand should contain 1 column(s)
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CREATE TABLE t1(a int, b int, c int);
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INSERT INTO t1 VALUES (1, 2, 3),
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(NULL, 2, 3 ), (1, NULL, 3 ), (1, 2, NULL),
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(NULL, 2, 3+1), (1, NULL, 3+1), (1, 2+1, NULL),
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(NULL, 2, 3-1), (1, NULL, 3-1), (1, 2-1, NULL);
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SELECT (1,2,3) = (1, NULL, 3);
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(1,2,3) = (1, NULL, 3)
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NULL
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SELECT (1,2,3) = (1+1, NULL, 3);
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(1,2,3) = (1+1, NULL, 3)
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0
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SELECT (1,2,3) = (1, NULL, 3+1);
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(1,2,3) = (1, NULL, 3+1)
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0
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SELECT * FROM t1 WHERE (a,b,c) = (1,2,3);
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a b c
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1 2 3
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SELECT (1,2,3) <> (1, NULL, 3);
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(1,2,3) <> (1, NULL, 3)
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NULL
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SELECT (1,2,3) <> (1+1, NULL, 3);
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(1,2,3) <> (1+1, NULL, 3)
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1
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SELECT (1,2,3) <> (1, NULL, 3+1);
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(1,2,3) <> (1, NULL, 3+1)
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1
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SELECT * FROM t1 WHERE (a,b,c) <> (1,2,3);
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a b c
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NULL 2 4
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1 NULL 4
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1 3 NULL
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NULL 2 2
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1 NULL 2
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1 1 NULL
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SELECT (1,2,3) < (NULL, 2, 3);
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(1,2,3) < (NULL, 2, 3)
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NULL
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SELECT (1,2,3) < (1, NULL, 3);
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(1,2,3) < (1, NULL, 3)
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NULL
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SELECT (1,2,3) < (1-1, NULL, 3);
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(1,2,3) < (1-1, NULL, 3)
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0
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SELECT (1,2,3) < (1+1, NULL, 3);
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(1,2,3) < (1+1, NULL, 3)
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1
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SELECT * FROM t1 WHERE (a,b,c) < (1,2,3);
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a b c
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1 1 NULL
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SELECT (1,2,3) <= (NULL, 2, 3);
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(1,2,3) <= (NULL, 2, 3)
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NULL
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SELECT (1,2,3) <= (1, NULL, 3);
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(1,2,3) <= (1, NULL, 3)
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NULL
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SELECT (1,2,3) <= (1-1, NULL, 3);
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(1,2,3) <= (1-1, NULL, 3)
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0
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SELECT (1,2,3) <= (1+1, NULL, 3);
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(1,2,3) <= (1+1, NULL, 3)
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1
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SELECT * FROM t1 WHERE (a,b,c) <= (1,2,3);
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a b c
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1 2 3
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1 1 NULL
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SELECT (1,2,3) > (NULL, 2, 3);
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(1,2,3) > (NULL, 2, 3)
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NULL
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SELECT (1,2,3) > (1, NULL, 3);
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(1,2,3) > (1, NULL, 3)
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NULL
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SELECT (1,2,3) > (1-1, NULL, 3);
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(1,2,3) > (1-1, NULL, 3)
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1
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SELECT (1,2,3) > (1+1, NULL, 3);
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(1,2,3) > (1+1, NULL, 3)
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0
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SELECT * FROM t1 WHERE (a,b,c) > (1,2,3);
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a b c
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1 3 NULL
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SELECT (1,2,3) >= (NULL, 2, 3);
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(1,2,3) >= (NULL, 2, 3)
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NULL
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SELECT (1,2,3) >= (1, NULL, 3);
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(1,2,3) >= (1, NULL, 3)
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NULL
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SELECT (1,2,3) >= (1-1, NULL, 3);
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(1,2,3) >= (1-1, NULL, 3)
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1
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SELECT (1,2,3) >= (1+1, NULL, 3);
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(1,2,3) >= (1+1, NULL, 3)
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0
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SELECT * FROM t1 WHERE (a,b,c) >= (1,2,3);
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a b c
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1 2 3
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1 3 NULL
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DROP TABLE t1;
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SELECT ROW(1,1,1) = ROW(1,1,1) as `1`, ROW(1,1,1) = ROW(1,2,1) as `0`, ROW(1,NULL,1) = ROW(2,2,1) as `0`, ROW(1,NULL,1) = ROW(1,2,2) as `0`, ROW(1,NULL,1) = ROW(1,2,1) as `null` ;
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1 0 0 0 null
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1 0 0 0 NULL
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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
|
|
1 2 1 2 1
|
|
1 2 1 2 2
|
|
3 1 3 1 1
|
|
3 1 3 1 3
|
|
SELECT * FROM t1,t2 WHERE (t1.a,t1.b)=(t2.a,t2.b);
|
|
a b a b c
|
|
1 1 1 1 1
|
|
1 1 1 1 2
|
|
1 2 1 2 1
|
|
1 2 1 2 2
|
|
3 1 3 1 1
|
|
3 1 3 1 3
|
|
EXPLAIN SELECT * FROM t1,t2 WHERE t1.a=t2.a AND t1.b=2;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 index PRIMARY PRIMARY 8 NULL 6 Using where; Using index
|
|
1 SIMPLE t2 ref PRIMARY PRIMARY 4 test.t1.a 1 Using index
|
|
EXPLAIN SELECT * FROM t1,t2 WHERE (t1.a,t1.b)=(t2.a,2);
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 index PRIMARY PRIMARY 8 NULL 6 Using where; Using index
|
|
1 SIMPLE t2 ref PRIMARY PRIMARY 4 test.t1.a 1 Using index
|
|
SELECT * FROM t1,t2 WHERE t1.a=1 and t1.b=t2.b;
|
|
a b a b c
|
|
1 1 1 1 2
|
|
1 1 3 1 3
|
|
1 2 1 2 2
|
|
1 1 1 1 1
|
|
1 1 3 1 1
|
|
1 2 1 2 1
|
|
SELECT * FROM t1,t2 WHERE (t1.a,t1.b)=(t2.a,2);
|
|
a b a b c
|
|
1 2 1 1 1
|
|
1 2 1 1 2
|
|
1 2 1 2 1
|
|
1 2 1 2 2
|
|
3 2 3 1 1
|
|
3 2 3 1 3
|
|
EXPLAIN EXTENDED SELECT * FROM t1,t2 WHERE (t1.a,t1.b)=(t2.a,t2.b+1);
|
|
id select_type table type possible_keys key key_len ref rows filtered Extra
|
|
1 SIMPLE t1 index PRIMARY PRIMARY 8 NULL 6 100.00 Using index
|
|
1 SIMPLE t2 ref PRIMARY PRIMARY 4 test.t1.a 1 100.00 Using where; Using index
|
|
Warnings:
|
|
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)))
|
|
SELECT * FROM t1,t2 WHERE (t1.a,t1.b)=(t2.a,t2.b+1);
|
|
a b a b c
|
|
1 2 1 1 1
|
|
1 2 1 1 2
|
|
3 2 3 1 1
|
|
3 2 3 1 3
|
|
EXPLAIN EXTENDED SELECT * FROM t1,t2 WHERE (t1.a-1,t1.b)=(t2.a-1,t2.b+1);
|
|
id select_type table type possible_keys key key_len ref rows filtered Extra
|
|
1 SIMPLE t1 index NULL PRIMARY 8 NULL 6 100.00 Using index
|
|
1 SIMPLE t2 index NULL PRIMARY 12 NULL 7 100.00 Using where; Using index; Using join buffer (flat, BNL join)
|
|
Warnings:
|
|
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)))
|
|
SELECT * FROM t1,t2 WHERE (t1.a-1,t1.b)=(t2.a-1,t2.b+1);
|
|
a b a b c
|
|
1 2 1 1 2
|
|
3 2 3 1 3
|
|
1 2 1 1 1
|
|
3 2 3 1 1
|
|
EXPLAIN SELECT * FROM t2 WHERE a=3 AND b=2;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t2 ref PRIMARY PRIMARY 8 const,const 1 Using index
|
|
EXPLAIN SELECT * FROM t2 WHERE (a,b)=(3,2);
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t2 ref PRIMARY PRIMARY 8 const,const 1 Using index
|
|
SELECT * FROM t2 WHERE a=3 and b=2;
|
|
a b c
|
|
SELECT * FROM t2 WHERE (a,b)=(3,2);
|
|
a b c
|
|
EXPLAIN SELECT * FROM t1,t2 WHERE t2.a=t1.a AND t2.b=2 AND t2.c=1;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 index PRIMARY PRIMARY 8 NULL 6 Using index
|
|
1 SIMPLE t2 eq_ref PRIMARY PRIMARY 12 test.t1.a,const,const 1 Using index
|
|
EXPLAIN EXTENDED SELECT * FROM t1,t2 WHERE (t2.a,(t2.b,t2.c))=(t1.a,(2,1));
|
|
id select_type table type possible_keys key key_len ref rows filtered Extra
|
|
1 SIMPLE t1 index PRIMARY PRIMARY 8 NULL 6 100.00 Using index
|
|
1 SIMPLE t2 eq_ref PRIMARY PRIMARY 12 test.t1.a,const,const 1 100.00 Using index
|
|
Warnings:
|
|
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`.`t2`.`b` = 2) and (`test`.`t2`.`c` = 1))
|
|
SELECT * FROM t1,t2 WHERE (t2.a,(t2.b,t2.c))=(t1.a,(2,1));
|
|
a b a b c
|
|
1 1 1 2 1
|
|
1 2 1 2 1
|
|
EXPLAIN EXTENDED SELECT * FROM t1,t2 WHERE t2.a=t1.a AND (t2.b,t2.c)=(2,1);
|
|
id select_type table type possible_keys key key_len ref rows filtered Extra
|
|
1 SIMPLE t1 index PRIMARY PRIMARY 8 NULL 6 100.00 Using index
|
|
1 SIMPLE t2 eq_ref PRIMARY PRIMARY 12 test.t1.a,const,const 1 100.00 Using index
|
|
Warnings:
|
|
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`.`t2`.`b` = 2) and (`test`.`t2`.`c` = 1))
|
|
SELECT * FROM t1,t2 WHERE t2.a=t1.a AND (t2.b,t2.c)=(2,1);
|
|
a b a b c
|
|
1 1 1 2 1
|
|
1 2 1 2 1
|
|
DROP TABLE t1,t2;
|
|
CREATE TABLE t1(
|
|
a int, b int, c int, d int, e int, f int, g int, h int,
|
|
PRIMARY KEY (a,b,c,d,e,f,g)
|
|
);
|
|
INSERT INTO t1 VALUES (1,2,3,4,5,6,7,99);
|
|
SELECT h FROM t1 WHERE (a,b,c,d,e,f,g)=(1,2,3,4,5,6,7);
|
|
h
|
|
99
|
|
SET @x:= (SELECT h FROM t1 WHERE (a,b,c,d,e,f,g)=(1,2,3,4,5,6,7));
|
|
SELECT @x;
|
|
@x
|
|
99
|
|
DROP TABLE t1;
|
|
CREATE TABLE t1 (a INT, b INT);
|
|
INSERT INTO t1 VALUES (1,1);
|
|
SELECT ROW(a, 1) IN (SELECT SUM(b), 1) FROM t1 GROUP BY a;
|
|
ROW(a, 1) IN (SELECT SUM(b), 1)
|
|
1
|
|
SELECT ROW(a, 1) IN (SELECT SUM(b), 3) FROM t1 GROUP BY a;
|
|
ROW(a, 1) IN (SELECT SUM(b), 3)
|
|
0
|
|
DROP TABLE t1;
|
|
create table t1 (a varchar(200),
|
|
b int unsigned not null primary key auto_increment)
|
|
default character set 'utf8';
|
|
create table t2 (c varchar(200),
|
|
d int unsigned not null primary key auto_increment)
|
|
default character set 'latin1';
|
|
insert into t1 (a) values('abc');
|
|
insert into t2 (c) values('abc');
|
|
select * from t1,t2 where (a,b) = (c,d);
|
|
a b c d
|
|
abc 1 abc 1
|
|
select host,user from mysql.user where (host,user) = ('localhost','test');
|
|
host user
|
|
drop table t1,t2;
|
|
#
|
|
# Bug#52124 memory leaks like a sieve in datetime, timestamp, time, date fields + warnings
|
|
#
|
|
CREATE TABLE t1 (a DATETIME NOT NULL, b TINYINT);
|
|
INSERT INTO t1 VALUES (0, 0),(0, 0);
|
|
SELECT 1 FROM t1 WHERE ROW(a, b) >=
|
|
ROW('1', (SELECT 1 FROM t1 WHERE a > 1234));
|
|
1
|
|
DROP TABLE t1;
|
|
#
|
|
# Bug #54190: Comparison to row subquery produces incorrect result
|
|
#
|
|
SELECT ROW(1,2) = (SELECT 1,2 FROM DUAL WHERE 1 = 0);
|
|
ROW(1,2) = (SELECT 1,2 FROM DUAL WHERE 1 = 0)
|
|
NULL
|
|
SELECT ROW(1,2) = (SELECT 1,3 FROM DUAL WHERE 1 = 0);
|
|
ROW(1,2) = (SELECT 1,3 FROM DUAL WHERE 1 = 0)
|
|
NULL
|
|
CREATE TABLE t1 (i INT);
|
|
INSERT INTO t1 () VALUES (1), (2), (3);
|
|
SELECT ROW(1,2) = (SELECT 1,2 FROM t1 WHERE 1 = 0);
|
|
ROW(1,2) = (SELECT 1,2 FROM t1 WHERE 1 = 0)
|
|
NULL
|
|
SELECT ROW(1,2) = (SELECT 1,3 FROM t1 WHERE 1 = 0);
|
|
ROW(1,2) = (SELECT 1,3 FROM t1 WHERE 1 = 0)
|
|
NULL
|
|
SELECT i FROM t1 WHERE ROW(1,2) = (SELECT 1,2 FROM DUAL WHERE 1 = 0);
|
|
i
|
|
SELECT i FROM t1 WHERE ROW(1,2) = (SELECT 1,3 FROM DUAL WHERE 1 = 0);
|
|
i
|
|
DROP TABLE t1;
|
|
End of 5.1 tests
|