Github user cloud-fan commented on a diff in the pull request:

    https://github.com/apache/spark/pull/15024#discussion_r79118965
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/InMemoryCatalog.scala
 ---
    @@ -195,18 +195,31 @@ class InMemoryCatalog(
             throw new TableAlreadyExistsException(db = db, table = table)
           }
         } else {
    -      if (tableDefinition.tableType == CatalogTableType.MANAGED) {
    -        val dir = new Path(catalog(db).db.locationUri, table)
    -        try {
    -          val fs = dir.getFileSystem(hadoopConfig)
    -          fs.mkdirs(dir)
    -        } catch {
    -          case e: IOException =>
    -            throw new SparkException(s"Unable to create table $table as 
failed " +
    -              s"to create its directory $dir", e)
    +      val tableWithLocation = if (tableDefinition.tableType == 
CatalogTableType.MANAGED) {
    +        val defaultTableLocation = new Path(catalog(db).db.locationUri, 
table)
    +        // Ideally we can not create a managed table with location, but 
due to some limitations in
    +        // [[CreateDataSourceTableAsSelectCommand]], we have to create the 
table directory and
    +        // write out data before we create this table. We should handle 
this case and allow the
    +        // table location to be pre-created, as long as it's same with the 
default table location.
    +        if (tableDefinition.storage.locationUri.isDefined) {
    +          val givenTableLocation = new 
Path(tableDefinition.storage.locationUri.get).toUri.toString
    +          require(defaultTableLocation.toUri.toString == 
givenTableLocation)
    --- End diff --
    
    this is not user facing, if we hit this, we have a bug


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