public List<Record> build() {
      return Collections.unmodifiableList(records);
    }
Appends the rows to the table. If the table is partitioned then it will create the correct partitions.
@param rowSet The rows to add
@throws IOException If there is an exception during writing out the files
iceberg/iceberg-handler/src/test/java/org/apache/iceberg/mr/TestHelper.java