[ARROW-15712] [R] Add a type method for Expression

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 8.0.0
• Component/s: R
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/31164
• Assignee: Dragoș Moldovan-Grünfeld
• Reporter: Dragoș Moldovan-Grünfeld
• Created: 17/Feb/22 09:25
• Updated: 11/Jan/23 11:39
• Resolved: 18/Feb/22 14:01

Description

This would allow for more consistent syntax when extracting the type of an expression.

A block like this:

if (inherits(x, "Expression")) { 
class <- x$type()$ToString() 
} else { 
class <- type(x)$ToString() 
}

would be simplified to

class <- type(x)$ToString()

Issue Links

• Discovered while testing: ARROW-14817 [R] Implement bindings for lubridate::tz
• links to: GitHub Pull Request #12447