Github user tdas commented on a diff in the pull request: https://github.com/apache/spark/pull/21560#discussion_r198056760 --- Diff: sql/core/src/test/scala/org/apache/spark/sql/streaming/continuous/ContinuousAggregationSuite.scala --- @@ -50,6 +51,42 @@ class ContinuousAggregationSuite extends ContinuousSuiteBase { } } + test("multiple partitions with coalesce") { + val input = ContinuousMemoryStream[Int] + + val df = input.toDF().coalesce(1).agg(max('value)) + + testStream(df, OutputMode.Complete)( + AddData(input, 0, 1, 2), + CheckAnswer(2), + StopStream, + AddData(input, 3, 4, 5), + StartStream(), + CheckAnswer(5), + AddData(input, -1, -2, -3), + CheckAnswer(5)) + } + + test("multiple partitions with coalesce - multiple transformations") { + val input = ContinuousMemoryStream[Int] + + val df = input.toDF() + .coalesce(1) + .select('value as 'copy, 'value) + .where('copy =!= 2) + .agg(max('value)) --- End diff -- test transformations both before and after coalesce.
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