@Override
    protected SourceSplitBase toSplitType(String splitId, SourceSplitState splitState) {
        return splitState.toSourceSplit();
    }
Returns next meta group id according to received meta number and meta group size.
inlong-sort/sort-flink/cdc-base/src/main/java/org/apache/inlong/sort/cdc/base/source/reader/IncrementalSourceReader.java