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https://issues.apache.org/jira/browse/SPARK-41554?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17682333#comment-17682333
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Apache Spark commented on SPARK-41554:
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User 'fe2s' has created a pull request for this issue:
https://github.com/apache/spark/pull/39813
> Decimal.changePrecision produces ArrayIndexOutOfBoundsException
> ---------------------------------------------------------------
>
> Key: SPARK-41554
> URL: https://issues.apache.org/jira/browse/SPARK-41554
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.3.1
> Reporter: Oleksiy Dyagilev
> Priority: Major
>
> {{Reducing Decimal scale by more than 18 produces exception.}}
> {code:java}
> Decimal(1, 38, 19).changePrecision(38, 0){code}
> {code:java}
> java.lang.ArrayIndexOutOfBoundsException: 19
> at org.apache.spark.sql.types.Decimal.changePrecision(Decimal.scala:377)
> at
> org.apache.spark.sql.types.Decimal.changePrecision(Decimal.scala:328){code}
> Reproducing with SQL query:
> {code:java}
> sql("select cast(cast(cast(cast(id as decimal(38,15)) as decimal(38,30)) as
> decimal(38,37)) as decimal(38,17)) from range(3)").show{code}
> The bug exists for {{Decimal}} that is stored using compact long only, it
> works fine with {{Decimal}} that uses {{scala.math.BigDecimal}} internally.
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