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rdettaiJorge C. Leitao
9867c484152
rdettai authored and Jorge C. Leitao committed 7e503afda7a
ARROW-10389: [Rust] [DataFusion] Make the custom source implementation API more explicit

PR for https://issues.apache.org/jira/browse/ARROW-10389
> As you can see in ARROW-10368, I had quite a hard time figuring out that the TableProvider trait could be used to provide custom source implementations for DataFusion.
> I think that adding a `read_table(provider: Box<dyn TableProvider + Send + Sync>) -> Result<Arc<dyn DataFrame>>` method to the ExecutionContext and an example in the tests and/or in the examples folder would make the API more explicit.

Closes #8527 from rdettai/ARROW-10389-custom-source-dataframe

Authored-by: rdettai <rdettai@gmail.com>
Signed-off-by: Jorge C. Leitao <jorgecarleitao@gmail.com>