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https://issues.apache.org/jira/browse/SPARK-14451?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15229716#comment-15229716
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Apache Spark commented on SPARK-14451:
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User 'rxin' has created a pull request for this issue:
https://github.com/apache/spark/pull/12231
> Move encoder definition into Aggregator interface
> -------------------------------------------------
>
> Key: SPARK-14451
> URL: https://issues.apache.org/jira/browse/SPARK-14451
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Reynold Xin
> Assignee: Reynold Xin
>
> When we first introduced Aggregators, we required the user of Aggregators to
> (implicitly) specify the encoders. It would actually make more sense to have
> the encoders be specified by the implementation of Aggregators, since each
> implementation should have the most state about how to encode its own data
> type.
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