[ARROW-15475] [C++][Python] Add a space after commas in pretty-print output

• Type: Wish
• Status: In Progress
• Priority: Trivial
• Resolution: Unresolved
• Component/s: C++, Python
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/30951
• Assignee: Unassigned
• Reporter: Antoine Pitrou
• Created: 27/Jan/22 10:42
• Updated: 11/Jan/23 11:37

Description

Following ARROW-14798 we can have this kind of pretty-print output:

struct: [
  -- is_valid: all not null
  -- child 0 type: int64
  [0,1,2,3,4,...,45,46,47,48,49]
  -- child 1 type: list<item: string>
  [["crown","trunk","roots"],["roots","seeds"],...,[],["crown"]],
...,

IMHO it would read better as:

struct: [
  -- is_valid: all not null
  -- child 0 type: int64
  [0, 1, 2, 3, 4, ..., 45, 46, 47, 48, 49]
  -- child 1 type: list<item: string>
  [["crown", "trunk", "roots"], ["roots", "seeds"], ..., [], ["crown"]],
...,

Issue Links

• is a child of: ARROW-18359 PrettyPrint Improvements
• links to: GitHub Pull Request #12420