public synchronized void mapDirToOp(Path dir, Operator fop) {
    dirToFop.put(dir.toUri().toString(), fop);
  }
Adds a mapping from the load work to the file sink operator.

@param dir The directory name.
@param fop The sink operator.
ql/src/java/org/apache/hadoop/hive/ql/session/LineageState.java