cloud-fan commented on PR #45181:
URL: https://github.com/apache/spark/pull/45181#issuecomment-1968268514
> df.count() and df.collect().size should always agree.
how about this idea: when calling `df.collect()`, if the plan is cached but
the physical plan is not a cache scan, then we do `df.select("*").collect()`
instead of executing the current physical plan.
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