[ARROW-9839] [Rust] [DataFusion] Add ability to downcast ExecutionPlan to specific operator

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.0.0
• Component/s: Rust, Rust - DataFusion
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/25877
• Assignee: Andy Grove
• Reporter: Andy Grove
• Created: 23/Aug/20 22:42
• Updated: 11/Jan/23 08:09
• Resolved: 26/Sep/20 20:27

Description

Sometimes it is necessary to have operator-specific logic in a query optimizer, so we need the ability to get an Any reference to an ExecutionPlan so we can downcast it.

We do something very similar in PrimitiveArray already with an as_any method but the difference there is we can call get_type first to know exactly what type to cast to and we don't have anything like that in ExecutionPlan, but we could at least speculatively  try casting to specific operators.

Issue Links

• links to: GitHub Pull Request #8284