final boolean carriesUnmergeableSack() {
        // hmmm... serialization in OLAP destroys the transient sideEffects
        return null != this.sack && (null == this.sideEffects || null == this.sideEffects.getSackMerger());
    }
@author Marko A. Rodriguez (http://markorodriguez.com)
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/traverser/B_O_S_SE_SL_Traverser.java