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Posted to jira@arrow.apache.org by "Andrew Lamb (Jira)" <ji...@apache.org> on 2020/12/09 20:48:00 UTC

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

Andrew Lamb created ARROW-10865:
-----------------------------------

             Summary: [Rust][DataFusion] More ergonomic conversion between Schema, SchemaRef, DFSchema, and DFSchemaRef
                 Key: ARROW-10865
                 URL: https://issues.apache.org/jira/browse/ARROW-10865
             Project: Apache Arrow
          Issue Type: Improvement
            Reporter: Andrew Lamb


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>




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