SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 4)
   ExpressionList (children 3)
    Function toString (alias r1) (children 1)
     ExpressionList (children 1)
      Identifier a
    Identifier b
    Function count (children 1)
     ExpressionList
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier test_group_by_with_rollup_order
   ExpressionList (children 2)
    Identifier r1
    Identifier b
   ExpressionList (children 2)
    OrderByElement (children 1)
     Identifier b
    OrderByElement (children 1)
     Identifier r1
