public Object getFileId(Path deltaFile, int bucketId, Configuration conf) {
      boolean forceSynthetic = !HiveConf.getBoolVar(conf, HiveConf.ConfVars.LLAP_IO_USE_FILEID_PATH);
      if (fileId != null && !forceSynthetic) {
        return fileId;
      }
      // Calculate the synthetic fileid
      return new SyntheticFileId(deltaFile, length, modTime);
    }
@param minWriteId min writeId of the delta directory
@param maxWriteId max writeId of the delta directory
@param stmtIds delta dir suffixes when a single txn writes &gt; 1 delta in the same partition
@param visibilityTxnId maybe 0, if the dir name didn't have it.  txnid:0 is always visible
@param deltaFiles bucketFiles in the directory
ql/src/java/org/apache/hadoop/hive/ql/io/AcidInputFormat.java