protected BinaryRowDataSerializerWrapper createKeySerializer(
      Schema mixedTableSchema, List<String> keys) {
    Schema keySchema = SchemaUtil.selectInOrder(mixedTableSchema, keys);
    return new BinaryRowDataSerializerWrapper(keySchema);
  }
Use a unique index to lookup. Working for the situation where the join keys include the
mixed-format table's primary keys.
amoro-format-mixed/amoro-mixed-flink/amoro-mixed-flink-common/src/main/java/org/apache/amoro/flink/lookup/UniqueIndexTable.java