AngersZhuuuu commented on issue #26500: [SPARK-29874][SQL]Optimize Dataset.isEmpty() URL: https://github.com/apache/spark/pull/26500#issuecomment-556952943 ``` test("benchmark of empty") { var start = System.currentTimeMillis() var isEmpty = spark.range(10000000) .repartition(100) .limit(1) .groupBy() .count() .queryExecution.executedPlan.executeCollect().head.getLong(0) == 0 println(isEmpty) var end = System.currentTimeMillis() // scalastyle:off println(s"duration = ${end - start}") start = System.currentTimeMillis() isEmpty = spark.range(10000000) .repartition(100) .select() .queryExecution.executedPlan.executeTake(1) == 0 println(isEmpty) end = System.currentTimeMillis() // scalastyle:off println(s"duration = ${end - start}") } Result false duration = 7248 false duration = 1449 ``` @cloud-fan @maropu @srowen The test case is simple but can mimic the behavior before and after the API change.
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