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

    https://github.com/apache/spark/pull/13348#discussion_r64858912
  
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala ---
    @@ -665,7 +666,8 @@ private[sql] class SQLConf extends Serializable with 
CatalystConf with Logging {
       def variableSubstituteDepth: Int = getConf(VARIABLE_SUBSTITUTE_DEPTH)
     
       def warehousePath: String = {
    -    getConf(WAREHOUSE_PATH).replace("${system:user.dir}", 
System.getProperty("user.dir"))
    +    getConf(WAREHOUSE_PATH).replace("${system:user.dir}",
    +      new 
File(System.getProperty("user.dir")).toURI.toURL.toString).replace("//", "/")
    --- End diff --
    
    Very interesting! In the function `normalizePath` of `Path`, it replaces 
double forward slashes by a single forward slash. 
    
https://hadoop.apache.org/docs/r2.4.1/api/src-html/org/apache/hadoop/fs/Path.html
    
    We still need to do it here, even if `Path` can normalize it for us.


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