Intuition can fail you, with Drools more than with many other systems I know...

Basically, the exists preceding an accumulate is akin to
   if( list.size() > 0 )
      for( Elem el: list ){...}

-W

On 31 August 2011 16:58, chocksmith <<a href="x-msg://3089/user/SendEmail.jtp?type=node&amp;node=3298778&amp;i=0" target="_top" rel="nofollow" link="external">[hidden email]> wrote:

Humm... I do not have a benchmark. Thats only intuition... :-)
If the fact does not exist, then all the rest of the LHS do not need to be
tested/calculated. When I try to imagine how is the implementation of the
"collect"... It sounds logical avoiding it if we know that it is not
necessary.

But I agree with you... It is redundant.

Tx!
R.

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