Github user yhuai commented on a diff in the pull request:

    https://github.com/apache/spark/pull/13348#discussion_r64853158
  
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala ---
    @@ -55,7 +56,7 @@ object SQLConf {
       val WAREHOUSE_PATH = SQLConfigBuilder("spark.sql.warehouse.dir")
         .doc("The default location for managed databases and tables.")
         .stringConf
    -    .createWithDefault("${system:user.dir}/spark-warehouse")
    +    .createWithDefault("${system:user.dir}" + File.separator + 
"spark-warehouse")
    --- End diff --
    
    Although the path points to a local dir, this path is actually a hadoop 
filesystem path. So, I am wondering if we need to use `File.separator` at here? 
If we are running on Windows, does a hadoop filesystem path uses `\` as the 
separator?


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