When there is a type mismatch (e.g. String vs Integer) in a constraint, usually a type is coerced and a rule is fired.
rule "R2" when $f : MyFactB( strData == 20 ) then System.out.println( "R2 fired : $f = " + $f ); end
As far as I investigate, in case of AlphaNode, MVEL does the coercion. Also AlphaNode hashing does the coercion (https://github.com/kiegroup/drools/blob/7.5.0.Final/drools-core/src/main/java/org/drools/core/reteoo/CompositeObjectSinkAdapter.java#L748).
However, in case of JoinNode, it doesn't coerce so doesn't fire.
rule "R1" when MyFactA( $i : intData ) $f : MyFactB( strData == $i ) then System.out.println( "R1 fired : $f = " + $f ); end
- clones
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RHDM-677 Beta node indexes don't support type coercion
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- Closed
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- incorporates
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- Closed
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