AlterQuery  test (children 2)
 ExpressionList (children 1)
  AlterCommand ADD_PROJECTION (children 1)
   Projection (children 1)
    ProjectionSelectQuery (children 2)
     ExpressionList (children 2)
      Identifier b
      Identifier a
     ExpressionList (children 1)
      Literal UInt64_1
 Identifier test
