public void setOperatorId(String operatorId) {
    this.operatorId = operatorId;
    this.type = deriveOpType(operatorId);
  }
@param printer
@param indentFlag
@param branchOfJoinOp
         This parameter is used to show if it is a branch of a Join
         operator so that we can decide the corresponding indent.
@throws Exception
common/src/java/org/apache/hadoop/hive/common/jsonexplain/Op.java