[ARROW-14842] [C++] Improve precision range error messages for Decimal128Type/Decimal256Type

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 7.0.0
• Component/s: C, R
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/30372
• Assignee: Yibo Cai
• Reporter: Dragoș Moldovan-Grünfeld
• Created: 24/Nov/21 15:32
• Updated: 11/Jan/23 08:42
• Resolved: 30/Nov/21 05:10

Description

The error message surfaces in R like so:

decimal(0, 2)
Error: Invalid: Decimal precision out of range: 0

and

decimal(100, 2)
Error: Invalid: Decimal precision out of range: 100

 
Could we improve the error message to be a bit more informative? As it is it doesn't specify what the range should be (1 to 38 for Decimal128Type, for example).

Issue Links

• is related to: ARROW-13886 [R] Expand documentation for decimal()
• links to: GitHub Pull Request #11773