[ARROW-10865] [Rust][DataFusion] More ergonomic conversion between Schema, SchemaRef, DFSchema, and DFSchemaRef

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.0.0
• Component/s: Rust - DataFusion
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/26800
• Assignee: Andrew Lamb
• Reporter: Andrew Lamb
• Created: 09/Dec/20 20:47
• Updated: 11/Jan/23 08:16
• Resolved: 11/Dec/20 21:30

Description

https://github.com/apache/arrow/pull/8839 added a DFSchema wrapper object into DataFusion so we can represent multiple relations (e.g. tables) easily

However, it is somewhat annyoing to use now (as I discovered while trying to update IOx to use the latest version of Arrow).

Specifically, there are things like this:
```
Arc::new(DFSchema::from(&parquet.schema())?),
```
Instead I would like to be able to write

```
parquet.schema().try_into()?
```

There are several other conversions I would like to be able to use the standard Rust into or `try_into` for:

Schema -> DFSchema
Schema -> Arc<DFSchema>
Arc<Schema> -> DFSchema
Arc<Schema> -> Arc<DFSchema>

DFSchema -> Schema
DFSchema -> Arc<Schema>
Arc<DFSchema> -> Schema
Arc<DFSchema> -> Arc<Schema>

Issue Links

• links to: GitHub Pull Request #8888