Github user brkyvz commented on a diff in the pull request:
https://github.com/apache/spark/pull/17735#discussion_r113518581
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/streaming/StreamSuite.scala ---
@@ -120,6 +141,26 @@ class StreamSuite extends StreamTest {
assertDF(df)
}
+ test("Within the same streaming query, one StreamingRelation should only
be transformed to one " +
+ "StreamingExecutionRelation") {
+ val df =
spark.readStream.format(classOf[FakeDefaultSource].getName).load()
+ val query =
+ df.union(df)
+ .writeStream
+ .format("memory")
+ .queryName("memory")
+ .start()
+ .asInstanceOf[StreamingQueryWrapper]
+ .streamingQuery
+ val executionRelations =
+ query
+ .logicalPlan
+ .collect { case ser: StreamingExecutionRelation => ser }
+ assert(executionRelations.size == 2)
+ assert(executionRelations.distinct.size == 1)
+ query.stop()
--- End diff --
can you please wrap this in a `finally`?
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