presto-main/src/main/java/io/prestosql/operator/aggregation/ApproximateLongPercentileAggregations.java/ApproximateLongPercentileAggregations/checkWeight
class ApproximateLongPercentileAggregations:    private static void checkWeight(double weight)
    {
        checkCondition(weight > 0, INVALID_FUNCTION_ARGUMENT, "percentile weight must be > 0");
    }