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https://issues.apache.org/jira/browse/SPARK-34909?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-34909:
------------------------------------
Assignee: Apache Spark
> conv() does not convert negative inputs to unsigned correctly
> -------------------------------------------------------------
>
> Key: SPARK-34909
> URL: https://issues.apache.org/jira/browse/SPARK-34909
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.1.0
> Reporter: Tim Armstrong
> Assignee: Apache Spark
> Priority: Major
>
> {noformat}
> scala> spark.sql("select conv('-10', 11, 7)").show(20, 150)
> +-----------------------+
> | conv(-10, 11, 7)|
> +-----------------------+
> |4501202152252313413456|
> +-----------------------+
> scala> spark.sql("select hex(conv('-10', 11, 7))").show(20, 150)
> +----------------------------------------------+
> | hex(conv(-10, 11, 7))|
> +----------------------------------------------+
> |3435303132303231353232353233313334313334353600|
> +----------------------------------------------+
> {noformat}
> The correct result is 45012021522523134134555. The above output has an
> incorrect second-to-last digit (6 instead of 5) and the last digit is a
> non-printing character the null byte.
> I tracked the bug down to NumberConverter.unsignedLongDiv returning incorrect
> results. I tried replacing with java.lang.Long.divideUnsigned and that fixed
> it.
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