public String provider(TableFormat format) {
    Preconditions.checkArgument(
        format == TableFormat.MIXED_HIVE || format == TableFormat.MIXED_ICEBERG);
    return "arctic";
  }
Test base for all mixed-format tests.
amoro-format-mixed/amoro-mixed-spark/amoro-mixed-spark-3-common/src/test/java/org/apache/amoro/spark/test/MixedTableTestBase.java