Github user zsxwing commented on a diff in the pull request: https://github.com/apache/spark/pull/12049#discussion_r58116999 --- Diff: sql/core/src/test/scala/org/apache/spark/sql/streaming/StreamSuite.scala --- @@ -81,4 +85,62 @@ class StreamSuite extends StreamTest with SharedSQLContext { AddData(inputData, 1, 2, 3, 4), CheckAnswer(2, 4)) } + + test("DataFrame reuse") { + def assertDF(df: DataFrame) { + withTempDir { outputDir => + withTempDir { checkpointDir => + val query = df.write.format("parquet") + .option("checkpointLocation", checkpointDir.getAbsolutePath) + .startStream(outputDir.getAbsolutePath) + try { + eventually(timeout(streamingTimeout)) { + val outputDf = sqlContext.read.parquet(outputDir.getAbsolutePath).as[Long] + checkDataset[Long](outputDf, (0L to 10L).toArray: _*) + } + } finally { + query.stop() + } + } + } + } + + val df = sqlContext.read.format(classOf[FakeDefaultSource].getName).stream() + assertDF(df) + assertDF(df) + assertDF(df) --- End diff -- > I was saying that when I ran it locally it passed (without the other fixes in this PR) when there were only two. Seems weird. I just tested this test with the master branch (without any fixed in this PR) and it did fail when there were only two.
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