JkSelf commented on pull request #28954:
URL: https://github.com/apache/spark/pull/28954#issuecomment-652289881
@manuzhang I run the `test("Empty stage coalesced to 0-partition RDD")` in
`AdaptiveQueryExecSuite`. It seems there is no unnecessary tasks for the empty
partitions. The Spark UI is as following. And can you give a simple examples
to reproduce this issue? Thanks.
The related code is :
```
spark.conf.set("spark.sql.adaptive.enabled", "true")
spark.conf.set("spark.sql.autoBroadcastJoinThreshold", "-1")
val df1 = spark.range(10).withColumn("a", 'id)
val df2 = spark.range(10).withColumn("b", 'id)
val result = df1.where('a > 10).join(df2.where('b > 10),
"id").groupBy('a).count()
result.show()
```
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