@Override
    protected MySqlSplit toSplitType(String splitId, MySqlSplitState splitState) {
        return splitState.toMySqlSplit();
    }
The source reader for MySQL source splits.
copy from {@link com.ververica.cdc.connectors.mysql.source.reader.MySqlSourceReader}
inlong-sort/sort-flink/sort-flink-v1.15/sort-connectors/mysql-cdc/src/main/java/org/apache/inlong/sort/mysql/source/reader/MySqlSourceReader.java