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https://issues.apache.org/jira/browse/SPARK-27779?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dongjoon Hyun updated SPARK-27779:
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Affects Version/s: (was: 3.0.0)
3.1.0
> Regression when explode on map in Generate
> ------------------------------------------
>
> Key: SPARK-27779
> URL: https://issues.apache.org/jira/browse/SPARK-27779
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.1.0
> Reporter: L. C. Hsieh
> Priority: Major
>
> When I ran MiscBenchmark for SPARK-27707, I found a regression regarding
> explode map:
> {code}
> OpenJDK 64-Bit Server VM 1.8.0_212-8u212-b03-0ubuntu1.18.04.1-b03 on Linux
> 4.15.0-1021-aws
> Intel(R) Xeon(R) CPU E5-2670 v2 @ 2.50GHz
> generate explode map: Best Time(ms) Avg Time(ms)
> Stdev(ms) Rate(M/s) Per Row(ns) Relative
> ------------------------------------------------------------------------------------------------------------------------
> generate explode map wholestage off 50273 51458
> 1676 0.3 2996.5 1.0X
> generate explode map wholestage on 43113 43351
> 278 0.4 2569.8 1.2X
> {code}
> I got this benchmark result by running MiscBenchmark on current master. All
> benchmark result is at
> https://gist.github.com/viirya/c850b49e364e8e6aaa6271ae9e3343fc
> The last committed benchmark number in MiscBenchmark-results.txt:
> {code}
> OpenJDK 64-Bit Server VM 1.8.0_181-b13 on Linux 3.10.0-862.3.2.el7.x86_64
> Intel(R) Xeon(R) CPU E5-2670 v2 @ 2.50GHz
> generate explode map: Best/Avg Time(ms) Rate(M/s) Per
> Row(ns) Relative
> ------------------------------------------------------------------------------------------------
> generate explode map wholestage off 22128 / 22578 0.8
> 1318.9 1.0X
> generate explode map wholestage on 16421 / 16520 1.0
> 978.8 1.3X
> {code}
> It looks significant regression, hopefully I don't miss something...
> Maybe others can also help verify if there is really a regression.
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