[ARROW-12290] [Rust][DataFusion] Add input_file_name function

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: Rust
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/18601
• Assignee: Unassigned
• Reporter: Mike Seddon
• Created: 08/Apr/21 02:24
• Updated: 11/Jan/23 08:25

Description

For lineage and diffing purposes (used by protocols like DeltaLake) it can be useful to know the source of input data for a Dataframe. This adds the `input_file_name` function which, like Spark, returns the name of the file being read, or NULL if not available.

Issue Links

• links to: GitHub Pull Request #9944
• links to: GitHub Pull Request #9976