@org.apache.thrift.annotation.Nullable
    public static _Fields findByThriftId(int fieldId) {
      switch(fieldId) {
        case 1: // PRIMITIVE_ENTRY
          return PRIMITIVE_ENTRY;
        case 2: // ARRAY_ENTRY
          return ARRAY_ENTRY;
        case 3: // MAP_ENTRY
          return MAP_ENTRY;
        case 4: // STRUCT_ENTRY
          return STRUCT_ENTRY;
        case 5: // UNION_ENTRY
          return UNION_ENTRY;
        case 6: // USER_DEFINED_TYPE_ENTRY
          return USER_DEFINED_TYPE_ENTRY;
        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/TTypeEntry.java