[jboss-jira] [JBoss JIRA] Created: (JBRULES-547) Create a specialized "exists" node in reteoo

[Edson Tirelli (JIRA)]

Create a specialized "exists" node in reteoo
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                 Key: JBRULES-547
                 URL: http://jira.jboss.com/jira/browse/JBRULES-547
             Project: JBoss Rules
          Issue Type: Feature Request
      Security Level: Public (Everyone can see)
          Components: Drl Parser/Builder, Reteoo
            Reporter: Edson Tirelli
         Assigned To: Edson Tirelli
             Fix For: 3.1-m2


Currently, "exists" conditional element is implemented as a sequence of 2 "not" nodes. This is suboptimal for performance and adds complexity to the network with specialized constraints and the requirement for a specific RightInputAdapterNode.
Also, the currently implementation causes unnecessary work to be performed. For instance, trace the work done in the terminal node in the following example:

package org.drools

query "2 persons with the same status"
		p : Person($status : status, $age : age)
		exists Person(status == $status, age > $age);
end

So, replace current implementation for a specialized "ExistsNode".

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