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Fix for bug#44743: Join in combination with concat does not always work

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bug#44766: valgrind error when using convert() in a subquery

Problem: input and output buffers may be the same 
converting a string to some charset. 
That may lead to wrong results/valgrind warnings.  

Fix: use different buffers.


mysql-test/r/cast.result:
  Fix for bug#44743: Join in combination with concat does not always work
          bug#44766: valgrind error when using convert() in a subquery
    - test result.
mysql-test/r/func_concat.result:
  Fix for bug#44743: Join in combination with concat does not always work
          bug#44766: valgrind error when using convert() in a subquery
    - test result.
mysql-test/t/cast.test:
  Fix for bug#44743: Join in combination with concat does not always work
          bug#44766: valgrind error when using convert() in a subquery
    - test case.
mysql-test/t/func_concat.test:
  Fix for bug#44743: Join in combination with concat does not always work
          bug#44766: valgrind error when using convert() in a subquery
    - test case.
sql/item.cc:
  Fix for bug#44743: Join in combination with concat does not always work
          bug#44766: valgrind error when using convert() in a subquery
    - comment added.
sql/item_strfunc.cc:
  Fix for bug#44743: Join in combination with concat does not always work
          bug#44766: valgrind error when using convert() in a subquery
    - '&args[0]->str_value' used as a parameter of args[0]->val_str(),
      as 'str' may be equal to 'str_value' which we use as the output buffer
      converting strings.
sql/sql_string.cc:
  Fix for bug#44743: Join in combination with concat does not always work
          bug#44766: valgrind error when using convert() in a subquery
    - input and output buffers must NOT be the same.
This commit is contained in:
Ramil Kalimullin
2009-05-21 13:06:43 +05:00
parent 60955e54a2
commit 985df4dcdc
7 changed files with 108 additions and 2 deletions
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3
sql/sql_string.cc
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@@ -328,6 +328,9 @@ bool String::copy(const char *str, uint32 arg_length,
CHARSET_INFO *from_cs, CHARSET_INFO *to_cs, uint *errors)
{
uint32 offset;
DBUG_ASSERT(str != Ptr);
if (!needs_conversion(arg_length, from_cs, to_cs, &offset))
{
*errors= 0;