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https://issues.apache.org/jira/browse/SPARK-16523?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15925668#comment-15925668
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Takeshi Yamamuro commented on SPARK-16523:
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It seems all the sub-tickets resolved, so could we close this umbrella? cc:
[~qifan]
> Support Row Based Aggregation HashMap
> -------------------------------------
>
> Key: SPARK-16523
> URL: https://issues.apache.org/jira/browse/SPARK-16523
> Project: Spark
> Issue Type: Story
> Components: SQL
> Reporter: Qifan Pu
>
> For hash aggregation in Spark SQL, we use a fast aggregation hashmap to act
> as a "cache" in order to boost aggregation performance. Previously, the
> hashmap is backed by a `ColumnarBatch`. This has performance issues when we
> have wide schema for the aggregation table (large number of key fields or
> value fields).
> In this JIRA, we support another implementation of fast hashmap, which is
> backed by a `RowBatch`. We then automatically pick between the two
> implementations based on certain knobs.
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