private String getStatsSource() {
    return HiveConf.getVar(conf, ConfVars.HIVE_ICEBERG_STATS_SOURCE, HiveMetaHook.ICEBERG)
        .toUpperCase();
  }
@param jobConf Job configuration for InputFormat to access
@param deserializer Deserializer
@param exprNodeDesc Filter expression extracted by Hive
@return Entire filter to take advantage of Hive's pruning as well as Iceberg's pruning.
iceberg/iceberg-handler/src/main/java/org/apache/iceberg/mr/hive/HiveIcebergStorageHandler.java