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https://issues.apache.org/jira/browse/SPARK-39749?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gengliang Wang resolved SPARK-39749.
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Fix Version/s: 3.4.0
Resolution: Fixed
Issue resolved by pull request 37160
[https://github.com/apache/spark/pull/37160]
> Always 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.
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