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https://issues.apache.org/jira/browse/SPARK-40089?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17580377#comment-17580377
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Robert Joseph Evans commented on SPARK-40089:
---------------------------------------------
Never mind I figured out that there is a separate prefixComparator that does
the same kinds of checks. But I have a fix that works, so I will put up a PR
shortly.
> Doring of at least Decimal(20, 2) fails for some values near the max.
> ---------------------------------------------------------------------
>
> Key: SPARK-40089
> URL: https://issues.apache.org/jira/browse/SPARK-40089
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.2.0, 3.3.0, 3.4.0
> Reporter: Robert Joseph Evans
> Priority: Major
> Attachments: input.parquet
>
>
> I have been doing some testing with Decimal values for the RAPIDS Accelerator
> for Apache Spark. I have been trying to add in new corner cases and when I
> tried to enable the maximum supported value for a sort I started to get
> failures. On closer inspection it looks like the CPU is sorting things
> incorrectly. Specifically anything that is "999999999999999999.50" or above
> is placed as a chunk in the wrong location in the outputs.
> In local mode with 12 tasks.
> {code:java}
> spark.read.parquet("input.parquet").orderBy(col("a")).collect.foreach(System.err.println)
> {code}
>
> Here you will notice that the last entry printed is
> {{[999999999999999999.49]}}, and {{[999999999999999999.99]}} is near the top
> near {{[-999999999999999999.99]}}
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