[ARROW-13521] [C++][Docs] Add note about tdigest in compute functions docs

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Duplicate
• Fix Version/s: 6.0.0
• Component/s: C++, Documentation
• Labels: beginner
• External issue URL: https://github.com/apache/arrow/issues/29175
• Assignee: David Li
• Reporter: Ian Cook
• Created: 01/Aug/21 19:35
• Updated: 11/Jan/23 08:33
• Resolved: 02/Sep/21 14:08

Description

Users who are looking for an approximate quantile kernel might not recognize that tdigest is this. Add a note in docs/source/cpp/compute.rst saying that tdigest outputs the approximate quantile.

Issue Links

• duplicates: ARROW-13311 [C++][Documentation] List hash aggregate kernels somewhere