@Override
  public AcidSupportType supportsAcidOperations() {
    return AcidSupportType.WITHOUT_TRANSACTIONS;
  }
Iceberg's optimistic concurrency control fails to provide means for IOW and Insert operations isolation.
Use `hive.txn.ext.locking.enabled` config to create Hive locks in order to guarantee data consistency.
iceberg/iceberg-handler/src/main/java/org/apache/iceberg/mr/hive/HiveIcebergStorageHandler.java