[ARROW-17042] [C++] Add cast from decimal to string and back

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: C++
• Labels: Kernels good-second-issue
• External issue URL: https://github.com/apache/arrow/issues/32351
• Assignee: Quang Hoang
• Reporter: Weston Pace
• Created: 11/Jul/22 16:50
• Updated: 11/Jan/23 11:48

Description

We have Decimal128::ToString and Decimal256::ToString. I don't know how performant they are but it should be better than nothing. In addition, we have a lot of casting infrastructure already so this should just be an addition to that. There shouldn't be a lot of work required here. It will mostly be understanding how all the pieces are organized and connecting them together.

Issue Links

• is related to: ARROW-17458 [C++] CSV Writer: Unsupported cast from decimal to utf8
• links to: GitHub Pull Request #14232