Github user brkyvz commented on a diff in the pull request:
https://github.com/apache/spark/pull/18199#discussion_r121197102
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/execution/streaming/RateSourceSuite.scala
---
@@ -0,0 +1,195 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.sql.execution.streaming
+
+import java.util.concurrent.TimeUnit
+
+import org.apache.spark.sql.functions._
+import org.apache.spark.sql.streaming.{StreamingQueryException, StreamTest}
+import org.apache.spark.util.ManualClock
+
+class RateSourceSuite extends StreamTest {
+
+ import testImplicits._
+
+ case class AdvanceRateManualClock(seconds: Long) extends AddData {
+ override def addData(query: Option[StreamExecution]): (Source, Offset)
= {
+ assert(query.nonEmpty)
+ val rateSource = query.get.logicalPlan.collect {
+ case StreamingExecutionRelation(source, _) if
source.isInstanceOf[RateStreamSource] =>
+ source.asInstanceOf[RateStreamSource]
+ }.head
+
rateSource.clock.asInstanceOf[ManualClock].advance(TimeUnit.SECONDS.toMillis(seconds))
+ (rateSource, rateSource.getOffset.get)
+ }
+ }
+
+ test("basic") {
+ val input = spark.readStream
+ .format("rate")
+ .option("tuplesPerSecond", "10")
+ .option("useManualClock", "true")
+ .load()
+ testStream(input)(
+ AdvanceRateManualClock(seconds = 1),
+ CheckLastBatch((0 until 10).map(v => new java.sql.Timestamp(v *
100L) -> v): _*),
+ StopStream,
+ StartStream(),
+ // Advance 2 seconds because creating a new RateSource will also
create a new ManualClock
+ AdvanceRateManualClock(seconds = 2),
+ CheckLastBatch((10 until 20).map(v => new java.sql.Timestamp(v *
100L) -> v): _*)
+ )
+ }
+
+ test("uniform distribution of event timestamps: tuplesPerSecond > 1000")
{
+ val input = spark.readStream
+ .format("rate")
+ .option("tuplesPerSecond", "1500")
+ .option("useManualClock", "true")
+ .load()
+ .as[(java.sql.Timestamp, Long)]
+ .map(v => (v._1.getTime, v._2))
+ val expectedAnswer =
+ (0 until 1000).map(v => (v / 2, v)) ++ // Two values share the same
timestamp.
--- End diff --
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