public String getSplitId() {
        return splitId;
    }
The {@link SourceEvent} that {@link MySqlSourceReader} sends to {@link MySqlSourceEnumerator} to
pull binlog meta data, i.e. sending {@link BinlogSplitMetaEvent}.
inlong-sort/sort-flink/sort-flink-v1.13/sort-connectors/mysql-cdc/src/main/java/org/apache/inlong/sort/cdc/mysql/source/events/BinlogSplitMetaRequestEvent.java