maropu commented on issue #26881: [SPARK-30252][SQL] Disallow negative scale of 
Decimal under ansi mode
URL: https://github.com/apache/spark/pull/26881#issuecomment-572979217
 
 
   Oh, I see. We need too keep this Spark-specific behaviour for future 
releases? If no DBMS-like system accepts negative scales, I think it is worth 
making positive scale by default and keeping the old behaviour (negative scale) 
with a legacy option.

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