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https://issues.apache.org/jira/browse/SPARK-39749?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17568204#comment-17568204
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Apache Spark commented on SPARK-39749:
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User 'gengliangwang' has created a pull request for this issue:
https://github.com/apache/spark/pull/37221
> ANSI SQL mode: use plain string representation on casting Decimal to String
> ---------------------------------------------------------------------------
>
> Key: SPARK-39749
> URL: https://issues.apache.org/jira/browse/SPARK-39749
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.4.0
> Reporter: Gengliang Wang
> Assignee: Gengliang Wang
> Priority: Major
> Fix For: 3.4.0
>
>
> Currently, casting decimal as string type will result in Strings with
> exponential notations if the adjusted exponent is less than -6. This is
> consistent with BigDecimal.toString
> [https://docs.oracle.com/javase/8/docs/api/java/math/BigDecimal.html#toString]
>
> This is different from external databases like PostgreSQL/Oracle/MS SQL
> server. It doesn't compliant with the ANSI SQL standard either.
> -I suggest always using the plain string in the casting.-
> After discussions, I decide to put the new behavior on ANSI SQL mode.
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