cloud-fan commented on issue #10577: [SPARK-12616] [SQL] Making Logical Operator `Union` Support Arbitrary Number of Children URL: https://github.com/apache/spark/pull/10577#issuecomment-610833354 it works because `a` is not a union so this change is a noop to it. you can cache `a.union(b)` and then run `a.union(b).union(c)`.
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