Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/21018#discussion_r183638215 --- Diff: sql/core/src/test/scala/org/apache/spark/sql/CachedTableSuite.scala --- @@ -794,4 +795,28 @@ class CachedTableSuite extends QueryTest with SQLTestUtils with SharedSQLContext } } } + + private def checkIfNoJobTriggered(f: => DataFrame): DataFrame = { + var numJobTrigered = 0 + val jobListener = new SparkListener { + override def onJobStart(jobStart: SparkListenerJobStart): Unit = { + numJobTrigered += 1 + } + } + sparkContext.addSparkListener(jobListener) + try { + val df = f + assert(numJobTrigered === 0) --- End diff -- before this assert, we should make sure the event queue is empty, via `sparkContext.listenerBus.waitUntilEmpty`
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