Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/20387
> I thought it was a good thing to push a single node down at a time and
not depend on order.
The order must be taken care. For example, we can't push down a limit
through Filter, unless the entire filter is pushed into the data source.
Generally, if we pushed down multiple operators into a data source, we should
clearly define what the order is to apply these operators in the data source.
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