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Two questions on lineage aspects:
1. what's the difference between DatasetUpstreamLineage vs. UpstreamLineage aspects?
2. Why is DownstreamLineage aspect not part of DatasetAspect (<https://github.com/linkedin/datahub/blob/master/metadata-models/src/main/pegasus/com/linkedin/metadata/aspect/DatasetAspect.pdl|Link>)?

I know the naming is a bit confusing, but  `UpstreamLineage` is for dataset-level lineage, while `DatasetUpstreamLineage` is for the upcoming field-level lineage feature. See <https://github.com/linkedin/datahub/blob/master/docs/rfc/active/1841-lineage/field%20level%20lineage.md> for more details.

oh! okay; then, will there be `DatasetDownstreamLineage` as well?

Yes it'll be eventually added. <@UURM9KWBB> is driving that effort.

got it, perfect.  Thanks for quick response Mars.  Appreciate it.