presto-main/src/main/java/io/prestosql/cost/SemiJoinStatsCalculator.java/SemiJoinStatsCalculator/computeAntiJoin
class SemiJoinStatsCalculator:    public static PlanNodeStatsEstimate computeAntiJoin(PlanNodeStatsEstimate sourceStats, PlanNodeStatsEstimate filteringSourceStats, Symbol sourceJoinSymbol, Symbol filteringSourceJoinSymbol)
    {
        return compute(sourceStats, filteringSourceStats, sourceJoinSymbol, filteringSourceJoinSymbol,
                (sourceJoinSymbolStats, filteringSourceJoinSymbolStats) ->
                        max(sourceJoinSymbolStats.getDistinctValuesCount() * MIN_ANTI_JOIN_FILTER_COEFFICIENT,
                                sourceJoinSymbolStats.getDistinctValuesCount() - filteringSourceJoinSymbolStats.getDistinctValuesCount()));
    }