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https://issues.apache.org/jira/browse/SPARK-30252?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan reassigned SPARK-30252:
-----------------------------------
Assignee: wuyi
> Disallow negative scale of Decimal under ansi mode
> --------------------------------------------------
>
> Key: SPARK-30252
> URL: https://issues.apache.org/jira/browse/SPARK-30252
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: wuyi
> Assignee: wuyi
> Priority: Major
>
> According to SQL standard,
> {quote}4.4.2 Characteristics of numbers
> An exact numeric type has a precision P and a scale S. P is a positive
> integer that determines the number of significant digits in a particular
> radix R, where R is either 2 or 10. S is a non-negative integer.
> {quote}
> scale of Decimal should always be non-negative. And other mainstream
> databases, like Presto, PostgreSQL, also don't allow negative scale.
>
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