presto-hive/src/main/java/io/prestosql/plugin/hive/metastore/BooleanStatistics.java/BooleanStatistics/toString
class BooleanStatistics:    @Override
    public String toString()
    {
        return toStringHelper(this)
                .add("trueCount", trueCount)
                .add("falseCount", falseCount)
                .toString();
    }