algorithms: fix predicate for 'join'.
algorithms: fix predicate for 'join'.

jckarter/clay,iamrekcah/clay,iamrekcah/clay,aep/clay,jckarter/clay,iamrekcah/clay,jckarter/clay,aep/clay,jckarter/clay,aep/clay,aep/clay,jckarter/clay,mario-campos/clay,aep/clay,jckarter/clay,iamrekcah/clay,mario-campos/clay,mario-campos/clay,mario-campos/clay,aep/clay,mario-campos/clay,iamrekcah/clay