Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/12049#discussion_r57974213
--- 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 --
> This test passes if there are 2 of these but not 3? That seems a little
weird to me.
Indeed, we only need to test twice here.
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