stats/src/main/java/io/airlift/stats/cardinality/DenseHll.java
private boolean setOverflow(int bucket, int overflow)
    {
        for (int i = 0; i < overflows; i++) {
            if (overflowBuckets[i] == bucket) {
                overflowValues[i] = (byte) overflow;
                return true;
            }
        }
        return false;
    }
private boolean setOverflow(int bucket, int overflow)
    {
        for (int i = 0; i < overflows; i++) {
            if (overflowBuckets[i] == bucket) {
                overflowValues[i] = (byte) overflow;
                return true;
            }
        }
        return false;
    }
Returns false if not overflow bucket matching the given bucket id was found