[ARROW-17973] [C++] Expression::ToString wrong for nullary function call

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 10.0.0
• Component/s: C++
• Labels: good-first-issue pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/20446
• Assignee: Sanjiban Sengupta
• Reporter: Neal Richardson
• Created: 10/Oct/22 13:39
• Updated: 11/Jan/23 11:57
• Resolved: 11/Oct/22 14:06

Description

Easy reproducer from R:

library(arrow)
Expression$create("random")
# Expression
# rando)

If you give it an argument (invalid in the case of random(), but Expression doesn't know that), it's fine:

Expression$create("random", Expression$scalar(1))
# Expression
# random(1)

Issue Links

• links to: GitHub Pull Request #14370