[ARROW-10163] [Rust] [DataFusion] Add DictionaryArray coercion support

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.0
• Fix Version/s: 3.0.0
• Component/s: Rust - DataFusion
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/26172
• Assignee: Andrew Lamb
• Reporter: Andrew Lamb
• Created: 02/Oct/20 18:02
• Updated: 11/Jan/23 08:11
• Resolved: 18/Oct/20 19:13

Description

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There is code in the datafusion physical planner that coerces arguments to compatible types for some expressions (e.g. for equals: https://github.com/apache/arrow/blob/master/rust/datafusion/src/physical_plan/expressions.rs#L1153)

This code needs to be modified to understand dictionary types (so, for example we can express a predicate like col1 = "foo", where col1 is a DictionaryArray.

Issue Links

• links to: GitHub Pull Request #8359
• links to: GitHub Pull Request #8463