SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 4)
   ExpressionList (children 3)
    Identifier n
    Function maxMerge (alias x) (children 1)
     ExpressionList (children 1)
      Identifier s
    Function length (children 1)
     ExpressionList (children 1)
      Identifier x
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier aggr
   ExpressionList (children 1)
    Identifier n
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier n
