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Posted to issues@spark.apache.org by "Apache Spark (JIRA)" <ji...@apache.org> on 2015/07/29 01:06:04 UTC
[jira] [Assigned] (SPARK-9422) Remove the placeholder attributes
used in the aggregation buffers
[ https://issues.apache.org/jira/browse/SPARK-9422?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Apache Spark reassigned SPARK-9422:
-----------------------------------
Assignee: Yin Huai (was: Apache Spark)
> Remove the placeholder attributes used in the aggregation buffers
> -----------------------------------------------------------------
>
> Key: SPARK-9422
> URL: https://issues.apache.org/jira/browse/SPARK-9422
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Yin Huai
> Assignee: Yin Huai
>
> Originally, to merge two aggregation buffers, we create a mutable buffer with extra placeholder attributes to represent grouping expressions (because the input aggregation buffer has grouping keys). This was done to make the first implementation easy. We can remove it now, which can also help us to implement the hash aggregate operator using unsafe row as the buffer.
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