SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 2)
    Function JSONExtract (alias x) (children 1)
     ExpressionList (children 3)
      Literal \'{"string_value":null}\'
      Literal \'string_value\'
      Literal \'Nullable(String)\'
    Function toTypeName (children 1)
     ExpressionList (children 1)
      Identifier x