@Override
    public void start() {
        if (getNumberOfCurrentlyAssignedSplits() == 0) {
            context.sendSplitRequest();
        }
    }
The source reader for MySQL source splits.
inlong-sort/sort-flink/sort-flink-v1.13/sort-connectors/mysql-cdc/src/main/java/org/apache/inlong/sort/cdc/mysql/source/reader/MySqlSourceReader.java