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MDEV-8704 Wrong result for SELECT..WHERE LENGTH(double_column)!=6 AND double_column=100e0

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This commit is contained in:
Alexander Barkov
2015-09-07 10:50:27 +04:00
parent 5448e0a6dc
commit bf7a2bb12c
4 changed files with 183 additions and 0 deletions
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95
mysql-test/r/type_float.result
View File

@@ -532,3 +532,98 @@ DROP TABLE t1,t2;
#
# End of 10.0 tests
#
#
# MDEV-8704 Wrong result for SELECT..WHERE LENGTH(double_column)!=6 AND double_column=100e0
#
CREATE TABLE t1 (a DOUBLE(9,2));
INSERT INTO t1 VALUES (100),(110);
SELECT * FROM t1 WHERE LENGTH(a)!=6;
a
SELECT * FROM t1 WHERE LENGTH(a)!=6 AND a=100e0;
a
DROP TABLE t1;
CREATE TABLE t1 (a DOUBLE);
INSERT INTO t1 VALUES (100),(110);
SELECT * FROM t1 WHERE LENGTH(a)!=6;
a
100
110
SELECT * FROM t1 WHERE LENGTH(a)!=6 AND a=100e0;
a
100
EXPLAIN EXTENDED
SELECT * FROM t1 WHERE LENGTH(a)!=6 AND a=100e0;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 2 100.00 Using where
Warnings:
Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where (`test`.`t1`.`a` = 100e0)
EXPLAIN EXTENDED
SELECT * FROM t1 WHERE LENGTH(a)!=RAND() AND a=100e0;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 2 100.00 Using where
Warnings:
Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where ((`test`.`t1`.`a` = 100e0) and (<cache>(length(100)) <> rand()))
DROP TABLE t1;
CREATE TABLE t1 (a DOUBLE(10,1));
INSERT INTO t1 VALUES (1.1),(1.2),(1.3);
SELECT * FROM t1 WHERE LENGTH(a)!=3;
a
SELECT * FROM t1 WHERE LENGTH(a)!=3 AND a=1.10e0;
a
EXPLAIN EXTENDED
SELECT * FROM t1 WHERE LENGTH(a)!=3 AND a=1.10e0;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
Warnings:
Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where 0
# Notice 1.1 instead of 1.10 in the final WHERE condition
EXPLAIN EXTENDED
SELECT * FROM t1 WHERE LENGTH(a)!=RAND() AND a=1.10e0;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 100.00 Using where
Warnings:
Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where ((`test`.`t1`.`a` = 1.10e0) and (<cache>(length(1.1)) <> rand()))
DROP TABLE t1;
CREATE TABLE t1 (a DOUBLE(10,2));
INSERT INTO t1 VALUES (1.1),(1.2),(1.3);
SELECT * FROM t1 WHERE LENGTH(a)!=4;
a
SELECT * FROM t1 WHERE LENGTH(a)!=4 AND a=1.10e0;
a
EXPLAIN EXTENDED
SELECT * FROM t1 WHERE LENGTH(a)!=4 AND a=1.10e0;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
Warnings:
Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where 0
# Notice 1.10 in the final WHERE condition
EXPLAIN EXTENDED
SELECT * FROM t1 WHERE LENGTH(a)!=RAND() AND a=1.10e0;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 100.00 Using where
Warnings:
Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where ((`test`.`t1`.`a` = 1.10e0) and (<cache>(length(1.10)) <> rand()))
DROP TABLE t1;
CREATE TABLE t1 (a DOUBLE(10,3));
INSERT INTO t1 VALUES (1.1),(1.2),(1.3);
SELECT * FROM t1 WHERE LENGTH(a)!=5;
a
SELECT * FROM t1 WHERE LENGTH(a)!=5 AND a=1.10e0;
a
EXPLAIN EXTENDED
SELECT * FROM t1 WHERE LENGTH(a)!=5 AND a=1.10e0;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
Warnings:
Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where 0
# Notice 1.100 rather than 1.10 in the final WHERE condition
EXPLAIN EXTENDED
SELECT * FROM t1 WHERE LENGTH(a)!=RAND() AND a=1.10e0;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 100.00 Using where
Warnings:
Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where ((`test`.`t1`.`a` = 1.10e0) and (<cache>(length(1.100)) <> rand()))
DROP TABLE t1;
#
# End of 10.1 tests
#

64
mysql-test/t/type_float.test
View File

@@ -385,3 +385,67 @@ DROP TABLE t1,t2;
--echo #
--echo # End of 10.0 tests
--echo #
--echo #
--echo # MDEV-8704 Wrong result for SELECT..WHERE LENGTH(double_column)!=6 AND double_column=100e0
--echo #
# The original test case from the bug report
CREATE TABLE t1 (a DOUBLE(9,2));
INSERT INTO t1 VALUES (100),(110);
SELECT * FROM t1 WHERE LENGTH(a)!=6;
SELECT * FROM t1 WHERE LENGTH(a)!=6 AND a=100e0;
DROP TABLE t1;
# DOUBLE with no specific precision
CREATE TABLE t1 (a DOUBLE);
INSERT INTO t1 VALUES (100),(110);
SELECT * FROM t1 WHERE LENGTH(a)!=6;
SELECT * FROM t1 WHERE LENGTH(a)!=6 AND a=100e0;
EXPLAIN EXTENDED
SELECT * FROM t1 WHERE LENGTH(a)!=6 AND a=100e0;
EXPLAIN EXTENDED
SELECT * FROM t1 WHERE LENGTH(a)!=RAND() AND a=100e0;
DROP TABLE t1;
# The constant scale is bigger than the field scale
CREATE TABLE t1 (a DOUBLE(10,1));
INSERT INTO t1 VALUES (1.1),(1.2),(1.3);
SELECT * FROM t1 WHERE LENGTH(a)!=3;
SELECT * FROM t1 WHERE LENGTH(a)!=3 AND a=1.10e0;
EXPLAIN EXTENDED
SELECT * FROM t1 WHERE LENGTH(a)!=3 AND a=1.10e0;
--echo # Notice 1.1 instead of 1.10 in the final WHERE condition
EXPLAIN EXTENDED
SELECT * FROM t1 WHERE LENGTH(a)!=RAND() AND a=1.10e0;
DROP TABLE t1;
# The constant scale is equal to the field scale
CREATE TABLE t1 (a DOUBLE(10,2));
INSERT INTO t1 VALUES (1.1),(1.2),(1.3);
SELECT * FROM t1 WHERE LENGTH(a)!=4;
SELECT * FROM t1 WHERE LENGTH(a)!=4 AND a=1.10e0;
EXPLAIN EXTENDED
SELECT * FROM t1 WHERE LENGTH(a)!=4 AND a=1.10e0;
--echo # Notice 1.10 in the final WHERE condition
EXPLAIN EXTENDED
SELECT * FROM t1 WHERE LENGTH(a)!=RAND() AND a=1.10e0;
DROP TABLE t1;
# The constant scale is smaller than the field scale
CREATE TABLE t1 (a DOUBLE(10,3));
INSERT INTO t1 VALUES (1.1),(1.2),(1.3);
SELECT * FROM t1 WHERE LENGTH(a)!=5;
SELECT * FROM t1 WHERE LENGTH(a)!=5 AND a=1.10e0;
EXPLAIN EXTENDED
SELECT * FROM t1 WHERE LENGTH(a)!=5 AND a=1.10e0;
--echo # Notice 1.100 rather than 1.10 in the final WHERE condition
EXPLAIN EXTENDED
SELECT * FROM t1 WHERE LENGTH(a)!=RAND() AND a=1.10e0;
DROP TABLE t1;
--echo #
--echo # End of 10.1 tests
--echo #

22
sql/field.cc
View File

@@ -4639,6 +4639,28 @@ bool Field_real::get_date(MYSQL_TIME *ltime,ulonglong fuzzydate)
}
Item *Field_real::get_equal_const_item(THD *thd, const Context &ctx,
Item_field *field_item,
Item *const_item)
{
if (flags & ZEROFILL_FLAG)
return Field_num::get_equal_zerofill_const_item(thd, ctx,
field_item, const_item);
switch (ctx.subst_constraint()) {
case IDENTITY_SUBST:
if (const_item->decimal_scale() != Field_real::decimals())
{
double val= const_item->val_real();
return new (thd->mem_root) Item_float(thd, val, Field_real::decimals());
}
break;
case ANY_SUBST:
break;
}
return const_item;
}
String *Field_double::val_str(String *val_buffer,
String *val_ptr __attribute__((unused)))
{

2
sql/field.h
View File

@@ -1363,6 +1363,8 @@ public:
my_decimal *val_decimal(my_decimal *);
uint32 max_display_length() { return field_length; }
uint size_of() const { return sizeof(*this); }
Item *get_equal_const_item(THD *thd, const Context &ctx,
Item_field *field_item, Item *const_item);
};