[rules-users] Hashing in JoinNode and CompositeObjectAdapter

Dear developers, I have a question regarding the current implementation within reteoo. In both cases, the JoinNode and CompositeObjectAdapter is doing a linear search for Joins and "Splits" respectively. For the BetaNodes the decision using lists or maps is done in SingleBetaContraints() (line 82) this.indexed = depth >= 1 && DefaultBetaConstraints.isIndexable( constraint ); However, the MVELContraint (constraint) always returns false for an equijoin predicate (always the MVELContraint constructor without index flag is called). Consequently, createBetaMemory() creates lists rather than maps. These are finally joined in assertLeftTuple and assertObject of the JoinNode with complexity 2n-1. (Note: Of course, IndexLeftBetaMemoryOption.YES and IndexRightBetaMemoryOption.YES are set but ignored according to the SingleBetaContraints' constructor). Relatively similar the CompositeObjectAdapter: While propagating objects (CompositeObjectAdapter.propagateAssertObject) the method asks if a fieldIndex is hashed which always returns false. However, I cannot find any possibility to set this flag to true. Interestingly the fields are added to a collection called hashedFieldIndexes in FieldIndex.registerFieldIndex. Moreover the code for dispatching to the right sink via hashcode is there, but is not reachable anyway. Are there any design related reasons for not supporting this or am I missing something? If not, I would love to open a FR for that. If someone helps me in setting up the mvn stuff I could do that myself. (Version 5.4.0.Final) Thanks, Philipp