Method read_json

sql/item_jsonfunc.cc:999–1018

String *Item_func_json_unquote::read_json(json_engine_t *je)
{
  String *js= args[0]->val_json(&tmp_s);

  if ((null_value= args[0]->null_value))
    return 0;

  json_scan_start(je, js->charset(),(const uchar *) js->ptr(),
                  (const uchar *) js->ptr() + js->length());

  if (json_read_value(je))
    goto error;

  return js;

error:
  if (je->value_type == JSON_VALUE_STRING)
    report_json_error(js, je, 0);
  return js;
}


String *Item_func_json_unquote::val_str(String *str)