[ARROW-10575] [Rust] Rename union.rs to be cosistent with other arrays

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 3.0.0
• Component/s: Rust
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/26539
• Assignee: Paddy Horan
• Reporter: Paddy Horan
• Created: 13/Nov/20 01:59
• Updated: 11/Jan/23 08:14
• Resolved: 13/Nov/20 13:28

Description

Each type of array was split into it's own module but union was not renamed to be consistent (it was split out previously)

Issue Links

• links to: GitHub Pull Request #8656