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-610744118 The cache key is the logical plan. If `a` is cached, ideally `a.union(b)` should leverage the cache of `a`, but we can't as a tradeoff to make the logical plan simple.
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