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https://issues.apache.org/jira/browse/SPARK-11658?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15000563#comment-15000563
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Apache Spark commented on SPARK-11658:
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User 'snowch' has created a pull request for this issue:
https://github.com/apache/spark/pull/9631
> simplify documentation for PySpark combineByKey
> -----------------------------------------------
>
> Key: SPARK-11658
> URL: https://issues.apache.org/jira/browse/SPARK-11658
> Project: Spark
> Issue Type: Improvement
> Components: Documentation, PySpark
> Affects Versions: 1.5.1
> Reporter: chris snow
> Priority: Minor
>
> The current documentation for combineByKey looks like this:
> {code}
> >>> x = sc.parallelize([("a", 1), ("b", 1), ("a", 1)])
> >>> def f(x): return x
> >>> def add(a, b): return a + str(b)
> >>> sorted(x.combineByKey(str, add, add).collect())
> [('a', '11'), ('b', '1')]
> """
> {code}
> I think it could be simplified to:
> {code}
> >>> x = sc.parallelize([("a", 1), ("b", 1), ("a", 1)])
> >>> def add(a, b): return a + str(b)
> >>> x.combineByKey(str, add, add).collect()
> [('a', '11'), ('b', '1')]
> """
> {code}
> I'll shortly add a patch for this.
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