cloud-fan commented on issue #25308: [SPARK-28576][SQL] fix the dead lock issue 
when enable new adaptive execution
URL: https://github.com/apache/spark/pull/25308#issuecomment-517576697
 
 
   I tried #25316 (rebased to the latest master) myself, and the UI works:
   ```
   scala> spark.conf.set("spark.sql.adaptive.enabled", "true")
   
   scala> spark.range(10).createTempView("v1")
   
   scala> spark.range(20).createTempView("v2")
   
   scala> sql("select id from v1 where id = (select count(*) from 
v2)").createTempView("v3")
   
   scala> sql("select max(id) from v3").collect
   res4: Array[org.apache.spark.sql.Row] = Array([null])
   ```
   
![image](https://user-images.githubusercontent.com/3182036/62350103-46aa3f00-b534-11e9-9bc7-ccf61bec70ca.png)
   
   Can you try with vanilla Spark instead of your fork and see if it works?

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