Yang,

I am was suggesting to have regulation to impose particular order(although it might be a good additional feature as well).  Would like to just to keep the order as it was in collect list. Especially if we are returning List that means it is an ordered collection by definition. It looks like somewhere in the internals of collect there is a HashSet, sitead of ArrayList used that changes the order of the items in the incoming list, and that is what I don’t agree with… I think it must be a bug,

-Sergey

---

From: rules-users-bounces@lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Yang Song
Sent: Monday, August 27, 2007 11:28 AM
To: Rules Users List
Subject: Re: [rules-users] collect return random order

I saw someone is requesting LIMIT, here I saw Manukyan is asking for ORDER BY, and also Mark is talking the FROM. Looks like the rule LHS part would become more and more like SQL SELECT statement. :)

I think it is the right way. Some Stream Database also extends the SQL to do event aggregation and correlation. The same can be applied to Rule Engine too.

Yang

On 8/27/07, Manukyan, Sergey <SManukyan@lear.com> wrote:

Folks,

When using collect on List of items with some filter (criteria), I need to have result in the same order as it was received:

F.e. I have a list of suppliers :

List()  :   Supplier("FIRST", Status.ACTIVE),  Supplier("SECOND", Status.INACTIVE), Supplier("THIRD", Status.INACTIVE )

And I need to find first INACTIVE supplier, so it must be SECOND supplier.

So doing the following :

When

$l : List()  // list of suppliers

$inactive_supp : ArrayList() from collect Supplier(status == Status.INACTIVE) from $l

Then

            System.out.println($l); // prints FIRST, SECOND, THIRD

System.out.println($inactive_supp);  // prints THIRD, SECOND  …. Instead of SECOND , THIRD

So I am getting THIRD supplier instead of SECOND as the result..

Please advise if it is a bug .., or there is another way of doing that…

Thanks,

-Sergey

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