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Fix QUOTE() to not reuse the input field for output, which resulted in

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incorrect results when the input was a constant across a multi-row SELECT
statement. (Bug #8248)


sql/item_strfunc.h:
  Add tmp_value member
sql/item_strfunc.cc:
  Always allocate a new string for QUOTE(), in case the field is being reused
  for multiple rows.
mysql-test/t/func_str.test:
  Add regression test
mysql-test/r/func_str.result:
  Add test results
This commit is contained in:
unknown
2005-02-01 18:29:10 -08:00
parent faca00b5d5
commit 6d0d03dab9
4 changed files with 18 additions and 10 deletions
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7
mysql-test/r/func_str.result
View File

@ -297,3 +297,10 @@ quote(ltrim(concat(' ', 'a')))
select quote(trim(concat(' ', 'a')));
quote(trim(concat(' ', 'a')))
'a'
CREATE TABLE t1 SELECT 1 UNION SELECT 2 UNION SELECT 3;
SELECT QUOTE('A') FROM t1;
QUOTE('A')
'A'
'A'
'A'
DROP TABLE t1;

5
mysql-test/t/func_str.test
View File

@ -193,3 +193,8 @@ select trim(leading 'foo' from 'foo');
select quote(ltrim(concat(' ', 'a')));
select quote(trim(concat(' ', 'a')));
# Bad results from QUOTE(). Bug #8248
CREATE TABLE t1 SELECT 1 UNION SELECT 2 UNION SELECT 3;
SELECT QUOTE('A') FROM t1;
DROP TABLE t1;

15
sql/item_strfunc.cc
View File

@ -2183,18 +2183,13 @@ String *Item_func_quote::val_str(String *str)
for (from= (char*) arg->ptr(), end= from + arg_length; from < end; from++)
new_length+= get_esc_bit(escmask, (uchar) *from);
/*
We have to use realloc() instead of alloc() as we want to keep the
old result in arg
*/
if (arg->realloc(new_length))
if (tmp_value.alloc(new_length))
goto null;
/*
As 'arg' and 'str' may be the same string, we must replace characters
from the end to the beginning
We replace characters from the end to the beginning
*/
to= (char*) arg->ptr() + new_length - 1;
to= (char*) tmp_value.ptr() + new_length - 1;
*to--= '\'';
for (start= (char*) arg->ptr(),end= start + arg_length; end-- != start; to--)
{
@ -2222,9 +2217,9 @@ String *Item_func_quote::val_str(String *str)
}
}
*to= '\'';
arg->length(new_length);
tmp_value.length(new_length);
null_value= 0;
return arg;
return &tmp_value;
null:
null_value= 1;

1
sql/item_strfunc.h
View File

@ -535,6 +535,7 @@ public:
class Item_func_quote :public Item_str_func
{
String tmp_value;
public:
Item_func_quote(Item *a) :Item_str_func(a) {}
const char *func_name() const { return "quote"; }