public static void setValidWriteIdList(Configuration conf, ValidWriteIdList validWriteIds) {
    conf.set(ValidWriteIdList.VALID_WRITEIDS_KEY, validWriteIds.toString());
    LOG.debug("Setting ValidWriteIdList: " + validWriteIds.toString()
            + " isAcidTable: " + HiveConf.getBoolVar(conf, ConfVars.HIVE_TRANSACTIONAL_TABLE_SCAN, false)
            + " acidProperty: " + getAcidOperationalProperties(conf));
  }
Set the valid write id list for the current table scan.
ql/src/java/org/apache/hadoop/hive/ql/io/AcidUtils.java