Item *Item::safe_charset_converter(CHARSET_INFO *tocs)
{
  Item_func_conv_charset *conv= new Item_func_conv_charset(this, tocs, 1);
  return conv->safe ? conv : NULL;
}
Item *Item::safe_charset_converter(CHARSET_INFO *tocs)
{
  Item_func_conv_charset *conv= new Item_func_conv_charset(this, tocs, 1);
  return conv->safe ? conv : NULL;
}