[jira] [Created] (SPARK-30252) Disallow negative scale of Decimal under ansi mode

["wuyi (Jira)" <ji...@apache.org>]

wuyi created SPARK-30252:
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             Summary: 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


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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