[ARROW-13119] [R] Set empty schema in scalar Expressions

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 5.0.0
• Component/s: R
• External issue URL: https://github.com/apache/arrow/issues/28821
• Assignee: Ian Cook
• Reporter: Ian Cook
• Created: 18/Jun/21 15:20
• Updated: 11/Jan/23 08:31
• Resolved: 25/Jun/21 21:09

Description

Closely related to ARROW-13117 is the problem of type() and type_id() not working for scalar expressions. For example, currently this happens:

> Expression$scalar("foo")$type()
Error: !is.null(schema) is not TRUE

> Expression$scalar(42L)$type()
Error: !is.null(schema) is not TRUE

This is what we want to happen:

> Expression$scalar("foo")$type()
Utf8
string

> Expression$scalar(42L)$type()
Int32
int32

This is simple to solve; we just need to set schema to an empty schema for all scalar expressions.

Issue Links

• relates to: ARROW-13117 [R] Retain schema in new Expressions
• links to: GitHub Pull Request #10563