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https://issues.apache.org/jira/browse/SPARK-13453?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15158927#comment-15158927
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Sean Owen commented on SPARK-13453:
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It's not supposed to. You have access to the key after aggregation and can
further transform.
> Including groupKey in the signature of aggregateByKey
> -----------------------------------------------------
>
> Key: SPARK-13453
> URL: https://issues.apache.org/jira/browse/SPARK-13453
> Project: Spark
> Issue Type: Improvement
> Reporter: Anton Anastasov
> Priority: Minor
>
> The signature of the aggregateByKey method over PairRDDs does not provide
> access to the actual key. My proposal is to create a new overloaded method
> that includes the key. This should not be hard.
> There is a workaround possible currently -- we can just map the PairRDD[K, V]
> to PairRDD[K, (K, V)], but this seems convoluted.
> Let me know what you think, and if I should go ahead with a pull request.
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