Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/20387
> We can add things like limit pushdown later, by adding it properly to the
existing code.
I tried and can't figure out how to do it with `PhysicalOperation`, that's
why I build something new for data source v2 pushdown. I'm OK to reuse it if
you can convince me `PhysicalOperation` is extendable, e.g. support limit push
down.
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