Are folks interested in seeing data property accumulators for RDDs? I made a proposal for this back in Spark 2016 ( https://docs.google.com/document/d/1lR_l1g3zMVctZXrcVjFusq2iQVpr4XvRK_UUDsDr6nk/edit ) but ABI compatibility was a stumbling block I couldn't design around. I can look at reviving it for Spark 3 or just go ahead and close out this idea.
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