public void copyPredicates(Operator<? extends OperatorDesc> srcOp,
        Operator<? extends OperatorDesc> tgtOp) {
      Set<Predicate> conds = getPredicates(srcOp);
      if (conds != null) {
        for (Predicate cond: conds) {
          addPredicate(tgtOp, cond);
        }
      }
    }
Merges the new dependencies in dep to the existing dependencies
of (op, ci).

@param op The operator of the column whose dependency is being modified.
@param ci The column info of the associated column.
@param dep The new dependency.
ql/src/java/org/apache/hadoop/hive/ql/optimizer/lineage/LineageCtx.java