public MySqlSourceBuilder<T> distributionFactorUpper(double distributionFactorUpper) {
        this.configFactory.distributionFactorUpper(distributionFactorUpper);
        return this;
    }
The upper bound of split key evenly distribution factor, the factor is used to determine
whether the table is evenly distribution or not.
inlong-sort/sort-flink/sort-flink-v1.15/sort-connectors/mysql-cdc/src/main/java/org/apache/inlong/sort/mysql/source/MySqlSourceBuilder.java