Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/16290
Generally, it looks good to me. The only concern is the external behavior
change. Since Spark 2.0, users are able to get the warehouse location by the
following two ways:
```Scala
spark.sql("set spark.sql.warehouse.dir").show()
```
```Scala
println(spark.conf.get("spark.sql.warehouse.dir"))
```
After this PR, the output will be `<undefined>`. Do we need extra code
changes to fix this? @cloud-fan
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