SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 5)
   ExpressionList (children 4)
    Identifier k1
    Identifier k2
    Identifier k3
    Function sum (alias v) (children 1)
     ExpressionList (children 1)
      Identifier value
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier t_proj_external
   ExpressionList (children 3)
    Identifier k1
    Identifier k2
    Identifier k3
   ExpressionList (children 3)
    OrderByElement (children 1)
     Identifier k1
    OrderByElement (children 1)
     Identifier k2
    OrderByElement (children 1)
     Identifier k3
   Set
