void addTable(TableDescriptor tableDescriptor, JobNode node) {
    tables.add(tableDescriptor);
    node.addTable(tableDescriptor);
  }
Add an intermediate stream from source to target {@link JobNode}
@param streamSpec intermediate stream
@param from the source node
@param to the target node
samza-core/src/main/java/org/apache/samza/execution/JobGraph.java