SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 5)
   ExpressionList (children 2)
    Identifier key
    Function sum (children 1)
     ExpressionList (children 1)
      Identifier agg
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier tbl
   ExpressionList (children 1)
    Identifier key
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier key
   Set
