[rules-users] collect return random order

[Yang Song]

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 at 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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