private @Nullable DeserializationSchema<RowData> createDeserialization(
            Context context,
            @Nullable DecodingFormat<DeserializationSchema<RowData>> format,
            int[] projection,
            @Nullable String prefix) {
        if (format == null) {
            return null;
        }
        DataType physicalFormatDataType = Projection.of(projection).project(this.physicalDataType);
        if (prefix != null) {
            physicalFormatDataType = DataTypeUtils.stripRowPrefix(physicalFormatDataType, prefix);
        }
        return format.createRuntimeDecoder(context, physicalFormatDataType);
    }
Flag to determine source mode. In upsert mode, it will keep the tombstone message. *
inlong-sort/sort-flink/sort-flink-v1.15/sort-connectors/kafka/src/main/java/org/apache/inlong/sort/kafka/table/KafkaDynamicSource.java