presto-main/src/main/java/io/prestosql/operator/aggregation/multimapagg/SingleMultimapAggregationState.java/SingleMultimapAggregationState/getEstimatedSize
class SingleMultimapAggregationState:    @Override
    public long getEstimatedSize()
    {
        return INSTANCE_SIZE + keyBlockBuilder.getRetainedSizeInBytes() + valueBlockBuilder.getRetainedSizeInBytes();
    }