[ARROW-12158] [Rust][DataFusion]: Implement support for the `now()` sql function

• Type: New Feature
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: Rust, Rust - DataFusion
• External issue URL: https://github.com/apache/arrow/issues/27979
• Assignee: Unassigned
• Reporter: Andrew Lamb
• Created: 30/Mar/21 19:47
• Updated: 11/Jan/23 08:24

Description

Usecase: selecting the last 5 minutes of data

I would like to be able to run queries like this:
```
select * from cpu where time > now() - interval '3' minute;
```

Proposed implementation:
follow postgres functions: https://www.postgresql.org/docs/current/functions-datetime.html