AlterQuery  test_max_mt_projections_alter (children 2)
 ExpressionList (children 1)
  AlterCommand ADD_PROJECTION (children 1)
   Projection (children 1)
    ProjectionSelectQuery (children 2)
     ExpressionList (children 1)
      Identifier c3
     Identifier c3
 Identifier test_max_mt_projections_alter
