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Posted to issues@spark.apache.org by "Robert Joseph Evans (Jira)" <ji...@apache.org> on 2022/08/15 20:05:00 UTC
[jira] [Commented] (SPARK-40089) Doring of at least Decimal(20, 2) fails for some values near the max.
[ https://issues.apache.org/jira/browse/SPARK-40089?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17579887#comment-17579887 ]
Robert Joseph Evans commented on SPARK-40089:
---------------------------------------------
I have been trying to debug this and it does not look like it is related to the partitioner. I can run with a single shuffle partition and I get the same results. Not sure if the prefix calculation is doing this or what.
> 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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