[rules-users] Re: accumulate over multiple types
As a workaround I replaced my query with a rule which does a logical
assert of a new WorkaroundMultiplePatternAccumulate object.
Then I do an accumulate of counting those.
Because it's dirty code atm (doing some class casting, still using the
double sum() function, ...),
I expected a noticable performance decrease for TTP.
To my surprise it was a performance increase of about 1%?!?
Can't wait to see MultiplePatternAccumulate implemented :)
Is there a jira issue to watch?
I 'll make a patch for sumInteger() tommorrow.
With kind regards,
Geoffrey De Smet
Mark Proctor wrote:
'accumulate' currently can only take a single Pattern,
multiple
correlated Patterns is scheduled for a future release (hopefully next
one). Also don't use semi colons they just aren't needed and in some
places break things.
Mark
Geoffrey De Smet wrote:
> I 'd like to get the number of queens which have the same y.
>
> I used to do this with a query:
> query "multipleQueensHorizontal"
> Queen($id : id, $y : y);
> Queen(id > $id, y == $y);
> end
> And then ask the size() of it.
>
> But now I should be able to do this with the accumulate function:
> $multipleQueensHorizontal : Integer()
> from accumulate(
> $q1 : Queen($id : id, $y : y);
> Queen(id > $id, y == $y);
> , count($q1)
> );
>
> However, I get a parsing error on it:
> Caused by: org.drools.rule.InvalidRulePackage: [31,37]:
> unknown:31:37 Unexpected token ';'[33,6]: unknown:33:6 mismatched
> token: [@123,814:814=',',<12>,33:6]; expecting type THEN
>
> Apparently the ; in of "$q1 : Queen($id : id, $y : y);" is inacceptable?
>
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