Github user cloud-fan commented on the issue: https://github.com/apache/spark/pull/13906 I'm not sure if this optimization is useful 1. empty `LocalRelation` is a corner case and seems not worth to optimize. 2. the optimization rule in this PR is kind of complex. 3. if we have better handling for `LocalRelation` in the futuren(like the `LocalNode`), this rule will become useless. cc @marmbrus @yhuai
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