@Override
  public List<TransformSpec> getPartitionTransformSpec(org.apache.hadoop.hive.ql.metadata.Table hmsTable) {
    Table table = IcebergTableUtil.getTable(conf, hmsTable.getTTable());
    return table.spec().fields().stream()
      .filter(f -> !f.transform().isVoid())
      .map(f -> {
        TransformSpec spec = IcebergTableUtil.getTransformSpec(
            table, f.transform().toString(), f.sourceId());
        spec.setFieldName(f.name());
        return spec;
      })
      .collect(Collectors.toList());
  }
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