AlterQuery  tp_1 (children 2)
 ExpressionList (children 1)
  AlterCommand ADD_PROJECTION (children 1)
   Projection (children 1)
    ProjectionSelectQuery (children 2)
     ExpressionList (children 2)
      Identifier x
      Function count (children 1)
       ExpressionList
     ExpressionList (children 1)
      Identifier x
 Identifier tp_1