Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/22547#discussion_r226363445
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/streaming/StreamSuite.scala ---
@@ -381,7 +390,7 @@ class StreamSuite extends StreamTest {
test("insert an extraStrategy") {
try {
- spark.experimental.extraStrategies = TestStrategy :: Nil
+ spark.experimental.extraStrategies = CustomStrategy :: Nil
--- End diff --
Since we need to do a temporary planning for streaming queries, we can't
allow custom strategy to remove streaming leaf nodes.
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