Github user jiangxb1987 commented on the issue:
https://github.com/apache/spark/pull/14619
@hvanhovell This idea is inspired by @cloud-fan, as he stated in
[comment](https://github.com/apache/spark/pull/13893#discussion_r73305098),
we'd better have a wrapper node for scan, so that the planner may match the
wrapper node directly instead of resolving the whole plan using
`PhysicalOperator`.
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