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https://issues.apache.org/jira/browse/SPARK-3056?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14636200#comment-14636200
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Apache Spark commented on SPARK-3056:
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User 'yhuai' has created a pull request for this issue:
https://github.com/apache/spark/pull/7458
> Sort-based Aggregation
> ----------------------
>
> Key: SPARK-3056
> URL: https://issues.apache.org/jira/browse/SPARK-3056
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Cheng Hao
>
> Currently, SparkSQL only support the hash-based aggregation, which may cause
> OOM if too many identical keys in the input tuples.
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