@Override
    public Offset createInitialOffset() {
        return PostgresOffset.INITIAL_OFFSET;
    }
The factory to create {@link PostgresOffset}.
inlong-sort/sort-flink/sort-flink-v1.13/sort-connectors/postgres-cdc/src/main/java/org/apache/inlong/sort/cdc/postgres/source/offset/PostgresOffsetFactory.java