presto-main/src/main/java/io/prestosql/operator/aggregation/histogram/SingleTypedHistogram.java/SingleTypedHistogram/getEstimatedSize
class SingleTypedHistogram:    @Override
    public long getEstimatedSize()
    {
        return INSTANCE_SIZE + values.getRetainedSizeInBytes() + counts.sizeOf() + hashPositions.sizeOf();
    }