[GitHub] spark pull request #15921: [SPARK-18493] Add missing python APIs: withWaterm...

[zsxwing <gi...@git.apache.org>]

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

    https://github.com/apache/spark/pull/15921#discussion_r88731845
  
    --- Diff: sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala ---
    @@ -485,7 +485,10 @@ class Dataset[T] private[sql](
       def isStreaming: Boolean = logicalPlan.isStreaming
     
       /**
    -   * Returns a checkpointed version of this Dataset.
    +   * Eagerly checkpoint a Dataset and return the new Dataset. Checkpointing can be used to truncate
    +   * the logical plan of this Dataset, which is especially useful in iterative algorithms where the
    +   * plan may grow exponentially. It will be saved to a file inside the checkpoint
    --- End diff --
    
    nit: `a file` -> `files`.
    
    Each partition will be saved to one file.


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