SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 2)
    Function midpoint (alias result) (children 1)
     ExpressionList (children 3)
      Literal NULL
      Literal NULL
      Literal NULL
    Function toTypeName (alias type) (children 1)
     ExpressionList (children 1)
      Identifier result