[Rust][DataFusion] Improve documentation for type coercion #26233
Description
The code / comments for type coercion are a little confusing and don't make the distinction between coercion and casting clear – we could improve the documentation to clarify this.
Reporter: Andrew Lamb / @alamb
Assignee: Andrew Lamb / @alamb
PRs and other links:
Note: This issue was originally created as ARROW-10235. Please see the migration documentation for further details.