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

    https://github.com/apache/spark/pull/17149#discussion_r109827042
  
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/execution/SparkSqlParser.scala ---
    @@ -386,7 +386,7 @@ class SparkSqlAstBuilder(conf: SQLConf) extends 
AstBuilder {
             "LOCATION and 'path' in OPTIONS are both used to indicate the 
custom table path, " +
               "you can only specify one of them.", ctx)
         }
    -    val customLocation = storage.locationUri.orElse(location)
    +    val customLocation = 
storage.locationUri.orElse(location.map(CatalogUtils.stringToURI(_)))
     
    --- End diff --
    
    It seems this has a double-de/encoding problem when the input path is an 
URI.
    
    ```scala
    scala> new org.apache.hadoop.fs.Path(new java.io.File("a 
b").toURI.toString).toUri.toString
    res1: String = file:/.../a%2520b
    ```
    
    A space character in URI is encoded as `%20` and `%` character is encoded 
as `%25`. A URI already has a %20 in it, and gets urlencoded again, from `%20` 
to `%2520`.



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