@org.apache.thrift.annotation.Nullable
    public static _Fields findByThriftId(int fieldId) {
      switch(fieldId) {
        case 1: // COLUMN_NAME
          return COLUMN_NAME;
        case 2: // TYPE_DESC
          return TYPE_DESC;
        case 3: // POSITION
          return POSITION;
        case 4: // COMMENT
          return COMMENT;
        default:
          return null;
      }
    }
Find the _Fields constant that matches fieldId, or null if its not found.
service-rpc/src/gen/thrift/gen-javabean/org/apache/hive/service/rpc/thrift/TColumnDesc.java