@Override
    public String toString() {
        return "BaseJoinProcessorNode{" +
               "joinThisProcessorParameters=" + joinThisProcessorParameters +
               ", joinOtherProcessorParameters=" + joinOtherProcessorParameters +
               ", joinMergeProcessorParameters=" + joinMergeProcessorParameters +
               ", valueJoiner=" + valueJoiner +
               ", thisJoinSideNodeName='" + thisJoinSideNodeName + '\'' +
               ", otherJoinSideNodeName='" + otherJoinSideNodeName + '\'' +
               "} " + super.toString();
    }
Utility base class containing the common fields between
a Stream-Stream join and a Table-Table join
streams/src/main/java/org/apache/kafka/streams/kstream/internals/graph/BaseJoinProcessorNode.java