public static <T, U extends Comparable<? super U>> Collector<T, ?, Seq<T>> medianAllBy(Function<? super T, ? extends U> function) {
        return medianAllBy(function, naturalOrder());
    }
Get a {@link Collector} that calculates the derived <code>PERCENTILE_DISC(percentile)</code> function given a specific ordering, producing multiple results.
jOOL-java-8/src/main/java/org/jooq/lambda/Agg.java