SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 2)
    Function ifNull (alias res) (children 1)
     ExpressionList (children 2)
      Literal NULL
      Literal NULL
    Function toTypeName (children 1)
     ExpressionList (children 1)
      Identifier res