public void putDependency(DataContainer dc, FieldSchema col, Dependency dep) {
    index.put(new DependencyKey(dc, col), dep);
  }
Puts the dependency for a table, column tuple.
@param dc The datacontainer whose dependency is being inserted.
@param col The column whose dependency is being inserted.
@param dep The dependency.
ql/src/java/org/apache/hadoop/hive/ql/hooks/LineageInfo.java