presto-main/src/main/java/io/prestosql/cost/StatisticRange.java/StatisticRange/addAndCollapseDistinctValues
class StatisticRange:    public StatisticRange addAndCollapseDistinctValues(StatisticRange other)
    {
        double overlapPercentOfThis = this.overlapPercentWith(other);
        double overlapPercentOfOther = other.overlapPercentWith(this);
        double overlapDistinctValuesThis = overlapPercentOfThis * distinctValues;
        double overlapDistinctValuesOther = overlapPercentOfOther * other.distinctValues;
        double maxOverlappingValues = max(overlapDistinctValuesThis, overlapDistinctValuesOther);
        double newDistinctValues = maxOverlappingValues + (1 - overlapPercentOfThis) * distinctValues + (1 - overlapPercentOfOther) * other.distinctValues;

        return new StatisticRange(minExcludeNaN(low, other.low), maxExcludeNaN(high, other.high), newDistinctValues);
    }