AlterQuery  summing (children 2)
 ExpressionList (children 2)
  AlterCommand ADD_COLUMN (children 2)
   ColumnDeclaration z (children 1)
    DataType UInt32
   Identifier y
  AlterCommand MODIFY_ORDER_BY (children 1)
   Function tuple (children 1)
    ExpressionList (children 3)
     Identifier x
     Identifier y
     Function negate (children 1)
      ExpressionList (children 1)
       Identifier z
 Identifier summing
