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Posted to issues@spark.apache.org by "Hyukjin Kwon (JIRA)" <ji...@apache.org> on 2019/05/21 04:02:16 UTC

[jira] [Updated] (SPARK-16523) Support Row Based Aggregation HashMap

     [ https://issues.apache.org/jira/browse/SPARK-16523?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Hyukjin Kwon updated SPARK-16523:
---------------------------------
    Labels: bulk-closed  (was: )

> 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
>            Priority: Major
>              Labels: bulk-closed
>
> 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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