public MySqlSourceConfigFactory fetchSize(int fetchSize) {
        this.fetchSize = fetchSize;
        return this;
    }
The maximum fetch size for per poll when read table snapshot.
inlong-sort/sort-flink/sort-flink-v1.13/sort-connectors/mysql-cdc/src/main/java/org/apache/inlong/sort/cdc/mysql/source/config/MySqlSourceConfigFactory.java