presto-main/src/main/java/io/prestosql/operator/aggregation/histogram/LegacyHistogramGroupState.java/LegacyHistogramGroupState/getEstimatedSize
class LegacyHistogramGroupState:    @Override
    public long getEstimatedSize()
    {
        return INSTANCE_SIZE + size + typedHistograms.sizeOf();
    }