@org.apache.thrift.annotation.Nullable
    public static _Fields findByThriftId(int fieldId) {
      switch(fieldId) {
        case 1: // NAME
          return NAME;
        case 2: // ATTRIBUTES
          return ATTRIBUTES;
        case 3: // CONFIGURATION
          return CONFIGURATION;
        case 4: // BLOCK_SIZE
          return BLOCK_SIZE;
        case 5: // BLOOMN_FILTER_TYPE
          return BLOOMN_FILTER_TYPE;
        case 6: // COMPRESSION_TYPE
          return COMPRESSION_TYPE;
        case 7: // DFS_REPLICATION
          return DFS_REPLICATION;
        case 8: // DATA_BLOCK_ENCODING
          return DATA_BLOCK_ENCODING;
        case 9: // KEEP_DELETED_CELLS
          return KEEP_DELETED_CELLS;
        case 10: // MAX_VERSIONS
          return MAX_VERSIONS;
        case 11: // MIN_VERSIONS
          return MIN_VERSIONS;
        case 12: // SCOPE
          return SCOPE;
        case 13: // TIME_TO_LIVE
          return TIME_TO_LIVE;
        case 14: // BLOCK_CACHE_ENABLED
          return BLOCK_CACHE_ENABLED;
        case 15: // CACHE_BLOOMS_ON_WRITE
          return CACHE_BLOOMS_ON_WRITE;
        case 16: // CACHE_DATA_ON_WRITE
          return CACHE_DATA_ON_WRITE;
        case 17: // CACHE_INDEXES_ON_WRITE
          return CACHE_INDEXES_ON_WRITE;
        case 18: // COMPRESS_TAGS
          return COMPRESS_TAGS;
        case 19: // EVICT_BLOCKS_ON_CLOSE
          return EVICT_BLOCKS_ON_CLOSE;
        case 20: // IN_MEMORY
          return IN_MEMORY;
        default:
          return null;
      }
    }
Find the _Fields constant that matches fieldId, or null if its not found.
hbase-thrift/src/main/java/org/apache/hadoop/hbase/thrift2/generated/TColumnFamilyDescriptor.java