Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/22402#discussion_r217576877
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/streaming/StreamingQuerySuite.scala
---
@@ -460,9 +460,9 @@ class StreamingQuerySuite extends StreamTest with
BeforeAndAfter with Logging wi
val streamingInputDF =
createSingleTriggerStreamingDF(streamingTriggerDF).toDF("value")
val progress =
getFirstProgress(streamingInputDF.join(streamingInputDF, "value"))
- assert(progress.numInputRows === 20) // data is read multiple times in
self-joins
--- End diff --
The exchange reuse is not triggered here, because the project of one side
is eliminated. In the kafka test, we have a cast in the project so Spark
doesn't eliminate project ay any side, and the trigger exchange reuse.
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