[JIRA] Created: (CAROB-47) error retrieving null value from a driverResultSet with getString

error retrieving null value from a driverResultSet with getString
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         Key: CAROB-47
         URL: https://forge.continuent.org/jira/browse/CAROB-47
     Project: Carob
        Type: Bug
  Components: C++ API  
 Environment: Paldo linux x86
IBM laptop R51 - 512MB memory
Sequoia 2.4 beta - backend mysql 5.0
    Reporter: Zsolt Simon
 Assigned to: Gilles Rayrat 
    Priority: Minor


When executing the above specified commands, an exception is thrown:
terminate called after throwing an instance of 'std::logic_error'
  what():  basic_string::_S_construct NULL not valid

The code fragment where this happening:
wstring DriverResultSet::getString(int32_t columnIndex) throw (SQLException,
    UnexpectedException)
{
  checkRowAndColPosAndSetNullFlag(columnIndex);
  if (wasNullFlag)
    return NULL; <---- exception is thrown here

wstring can't be initialized with NULL.
Needs another logic for this function to signal NULL values.



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