Function handle_expr_function_call

client/mysqltest.cc:7687–7824

*/

void handle_expr_function_call(enum func_type func_type,
                               Expression_value *result, const char **s)
{
  Expression_value args[MAX_FUNC_ARGS];
  int arg_count= 0;

  while (!match(s, ")"))
  {
    if (arg_count >= MAX_FUNC_ARGS)
      die("Too many function arguments (max %d)", MAX_FUNC_ARGS);

    expr(&args[arg_count], s);
    arg_count++;

    /* if the next character is a comma, skip it */
    if (match(s, ","))
      continue;

    if (match(s, ")"))
      break;

    die("Syntax error: Expected ',' or ')' in function call");
  }

  /* generic NULL propagation, except for IFNULL/NULLIF/COALESCE/CONCAT_WS */
  if (func_type != FUNC_IFNULL && func_type != FUNC_NULLIF &&
      func_type != FUNC_COALESCE && func_type != FUNC_CONCAT_WS)
  {
    for (int i= 0; i < arg_count; i++)
    {
      if (args[i].type == EXPR_NULL)
      {
        result->reset();
        return;
      }
    }
  }

  switch (func_type) {
  case FUNC_ABS:
    func_abs(args, arg_count, result);
    break;
  case FUNC_CONV:
    func_conv(args, arg_count, result);
    break;
  case FUNC_BIN:
    func_bin(args, arg_count, result);
    break;
  case FUNC_OCT:
    func_oct(args, arg_count, result);
    break;
  case FUNC_HEX:
    func_hex(args, arg_count, result);
    break;
  case FUNC_INSTR:
    func_instr(args, arg_count, result);
    break;
  case FUNC_LOCATE: