cloud-fan commented on issue #26500: [SPARK-29874][SQL]Optimize Dataset.isEmpty() URL: https://github.com/apache/spark/pull/26500#issuecomment-556974270 great! can you enrich the PR description? `Optimize Dataset.isEmpty()` is good in the "Why" section but we need to put more in the "What" section. e.g. we change the implementation to avoid shuffles.
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