Jungtaek Lim created SPARK-28247:
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             Summary: Flaky test: "query without test harness" in 
ContinuousSuite
                 Key: SPARK-28247
                 URL: https://issues.apache.org/jira/browse/SPARK-28247
             Project: Spark
          Issue Type: Bug
          Components: Structured Streaming
    Affects Versions: 3.0.0
            Reporter: Jungtaek Lim


This test has failed a few times in some PRs, as well as easy to reproduce 
locally. Example of a failure:
{noformat}
 [info] - query without test harness *** FAILED *** (2 seconds, 931 
milliseconds)
[info]   scala.Predef.Set.apply[Int](0, 1, 2, 3).map[org.apache.spark.sql.Row, 
scala.collection.immutable.Set[org.apache.spark.sql.Row]](((x$3: Int) => 
org.apache.spark.sql.Row.apply(x$3)))(immutable.this.Set.canBuildFrom[org.apache.spark.sql.Row]).subsetOf(scala.Predef.refArrayOps[org.apache.spark.sql.Row](results).toSet[org.apache.spark.sql.Row])
 was false
(ContinuousSuite.scala:226){noformat}



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