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https://issues.apache.org/jira/browse/SPARK-10100?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14705057#comment-14705057
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Yin Huai commented on SPARK-10100:
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I am changing the title of this jira to "Eliminate hash table lookup if there
is no grouping key in aggregation." since
https://github.com/apache/spark/pull/8332 is using this JIRA as the issue. For
the Max and Min expressions, we can revisit them later if we find a better way
to improve the performance.
> AggregateFunction2's Max is slower than AggregateExpression1's MaxFunction
> --------------------------------------------------------------------------
>
> Key: SPARK-10100
> URL: https://issues.apache.org/jira/browse/SPARK-10100
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 1.5.0
> Reporter: Yin Huai
> Assignee: Herman van Hovell
> Fix For: 1.5.0
>
> Attachments: SPARK-10100.perf.test.scala
>
>
> Looks like Max (probably Min) implemented based on AggregateFunction2 is
> slower than the old MaxFunction.
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