[ARROW-9751] [Rust] [DataFusion] Extend UDFs to accept more than one type per argument

• Type: New Feature
• 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/25803
• Assignee: Jorge Leitão
• Reporter: Jorge Leitão
• Created: 15/Aug/20 10:52
• Updated: 11/Jan/23 08:08
• Resolved: 09/Sep/20 00:57

Description

Most math functions accept float32 and float64, `length` will accept Utf8 and lists soon, etc.

The goal of this story is to allow UDFs to accept more than one datatype.

Design: the accepted datatypes should be a vector ordered by "faster/smaller" to "slower/larger" (cpu/memory). When the plan reaches a UDF, we try to cast the input expression like before, from "faster/smaller" to "slower/larger".

Issue Links

• links to: GitHub Pull Request #7967