@org.apache.thrift.annotation.Nullable
    public static _Fields findByThriftId(int fieldId) {
      switch(fieldId) {
        case 1: // COLS
          return COLS;
        case 2: // LOCATION
          return LOCATION;
        case 3: // INPUT_FORMAT
          return INPUT_FORMAT;
        case 4: // OUTPUT_FORMAT
          return OUTPUT_FORMAT;
        case 5: // COMPRESSED
          return COMPRESSED;
        case 6: // NUM_BUCKETS
          return NUM_BUCKETS;
        case 7: // SERDE_INFO
          return SERDE_INFO;
        case 8: // BUCKET_COLS
          return BUCKET_COLS;
        case 9: // SORT_COLS
          return SORT_COLS;
        case 10: // PARAMETERS
          return PARAMETERS;
        case 11: // SKEWED_INFO
          return SKEWED_INFO;
        case 12: // STORED_AS_SUB_DIRECTORIES
          return STORED_AS_SUB_DIRECTORIES;
        default:
          return null;
      }
    }
Find the _Fields constant that matches fieldId, or null if its not found.
standalone-metastore/metastore-common/src/gen/thrift/gen-javabean/org/apache/hadoop/hive/metastore/api/StorageDescriptor.java