private void setInputFormat(MapWork work, Operator<? extends OperatorDesc> op) {
    if (op == null) {
      return;
    }
    if (op.isUseBucketizedHiveInputFormat()) {
      work.setUseBucketizedHiveInputFormat(true);
      return;
    }

    if (op.getChildOperators() != null) {
      for (Operator<? extends OperatorDesc> childOp : op.getChildOperators()) {
        setInputFormat(work, childOp);
      }
    }
  }
TezCompiler translates the operator plan into TezTasks.
ql/src/java/org/apache/hadoop/hive/ql/parse/TezCompiler.java