cloud-fan commented on issue #26437: [SPARK-29800][SQL] Plan Exists 's subquery in PlanSubqueries URL: https://github.com/apache/spark/pull/26437#issuecomment-552329321 > If result is huge, it's a big cost. Yea true, we can add a LIMIT 1 to the scalar subquery before count, then the result won't be huge. This is also how we implement `Dataset.isEmpty`.
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