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

    https://github.com/apache/spark/pull/15998#discussion_r90103384
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/ExternalCatalog.scala
 ---
    @@ -189,11 +189,28 @@ abstract class ExternalCatalog {
           spec: TablePartitionSpec): Option[CatalogTablePartition]
     
       /**
    +   * List the names of all partitions that belong to the specified table, 
assuming it exists.
    --- End diff --
    
    Could you specify the return format of partitions (e.g. `/a=v1,b=v2`) and 
that the values are escape, and that callers can decode it using the functions 
found in PartitioningUtils?


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