[jboss-jira] [JBoss JIRA] (DROOLS-702) Rule Inheritance fired the sub rule even the condition doen't match

[ https://issues.jboss.org/browse/DROOLS-702?page=com.atlassian.jira.plugin... ] Davide Sottara edited comment on DROOLS-702 at 1/31/15 9:54 AM: ---------------------------------------------------------------- When a rule extends another, patterns will not be merged. If you have: {code} rule "parent" when $p : Person() then end {code} and {code} rule "child" when Person() then end {code} the engine cannot safely infer that those two patterns should match the SAME fact, so you end up with a cross-product of two patterns. In your reproducer, the number of firings is consistent with the cross product of the facts you inserted, so I don't see any bug here. As an alternative to "from", you can use unification: {code} $p := Person() {code} in both rules (parent and child) to ensure the two patterns are linked. [Edit: clarification: "from" ensures the pattern applied to the same object, while ":=" is still affected by equality] was (Author: dsotty): When a rule extends another, patterns will not be merged. If you have: {code} rule "parent" when $p : Person() then end {code} and {code} rule "child" when Person() then end {code} the engine cannot safely infer that those two patterns should match the SAME fact, so you end up with a cross-product of two patterns. In your reproducer, the number of firings is consistent with the cross product of the facts you inserted, so I don't see any bug here. As an alternative to "from", you can use unification: {code} $p := Person() {code} in both rules (parent and child) to ensure the two patterns are linked. -- This message was sent by Atlassian JIRA (v6.3.11#6341)