AlterQuery  test_xy (children 2)
 ExpressionList (children 1)
  AlterCommand UPDATE (children 2)
   Literal UInt64_1
   ExpressionList (children 1)
    Assignment y (children 1)
     Function transform (children 1)
      ExpressionList (children 4)
       Identifier x
       Subquery (children 1)
        SelectWithUnionQuery (children 1)
         ExpressionList (children 1)
          SelectQuery (children 2)
           ExpressionList (children 1)
            Function groupArray (children 1)
             ExpressionList (children 1)
              Identifier x
           TablesInSelectQuery (children 1)
            TablesInSelectQueryElement (children 1)
             TableExpression (children 1)
              Subquery (alias t1) (children 1)
               SelectWithUnionQuery (children 1)
                ExpressionList (children 1)
                 SelectQuery (children 3)
                  ExpressionList (children 2)
                   Identifier x
                   Identifier y
                  TablesInSelectQuery (children 1)
                   TablesInSelectQueryElement (children 1)
                    TableExpression (children 1)
                     TableIdentifier updates
                  ExpressionList (children 1)
                   OrderByElement (children 1)
                    Identifier x
       Subquery (children 1)
        SelectWithUnionQuery (children 1)
         ExpressionList (children 1)
          SelectQuery (children 2)
           ExpressionList (children 1)
            Function groupArray (children 1)
             ExpressionList (children 1)
              Identifier y
           TablesInSelectQuery (children 1)
            TablesInSelectQueryElement (children 1)
             TableExpression (children 1)
              Subquery (alias t2) (children 1)
               SelectWithUnionQuery (children 1)
                ExpressionList (children 1)
                 SelectQuery (children 3)
                  ExpressionList (children 2)
                   Identifier x
                   Identifier y
                  TablesInSelectQuery (children 1)
                   TablesInSelectQueryElement (children 1)
                    TableExpression (children 1)
                     TableIdentifier updates
                  ExpressionList (children 1)
                   OrderByElement (children 1)
                    Identifier x
       Identifier y
 Identifier test_xy
