public void setCurrentLookupIdentifier(final LookupIdentifier lookupIdentifier) {
        LOGGER.trace("Changing identifier from {} to {}", currentLookupIdentifier, lookupIdentifier);
        this.currentLookupIdentifier = lookupIdentifier;
        // Switched identifier so clear out the existing state

        effectiveStreams.clear();
        refDataValueProxy = null;
    }
Clears out all effective/qualifying streams and any {@link RefDataValueProxy}
stroom-pipeline/src/main/java/stroom/pipeline/refdata/ReferenceDataResult.java