public MySqlSourceBuilder<T> distributionFactorLower(double distributionFactorLower) {
        this.configFactory.distributionFactorLower(distributionFactorLower);
        return this;
    }
The lower 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