SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function JSONExtractKeysAndValues (children 1)
     ExpressionList (children 3)
      Literal \'{"x": {"a": 5, "b": 7, "c": 11}}\'
      Literal \'x\'
      Literal \'Int8\'