query data on S3

[benedetto73]

Is there an example program that queries data on S3?
I tried to modify the example program in here, but couldn't get past errors about registering an object store.

Error: DataFusionError(Execution("No object store available for: s3://...

EDIT
I guess the question could be rephrased as:
Would it be possible to have code examples for datafusion::execution::object_store::ObjectStoreRegistry (link) for the 2 mentioned use cases?
Thanks.

This allows for two different use-cases:

Systems where object store buckets are explicitly created using DDL, can register these buckets using [ObjectStoreRegistry::register_store](https://docs.rs/datafusion/35.0.0/datafusion/execution/object_store/trait.ObjectStoreRegistry.html#tymethod.register_store)

Systems relying on ad-hoc discovery, without corresponding DDL, can create [ObjectStore](https://docs.rs/object_store/0.9.0/x86_64-unknown-linux-gnu/object_store/trait.ObjectStore.html) lazily by providing a custom implementation of [ObjectStoreRegistry](https://docs.rs/datafusion/35.0.0/datafusion/execution/object_store/trait.ObjectStoreRegistry.html)

[benedetto73]

It seems I was missing this line in Cargo.toml:

ballista-core = { version = "0.12.0" , features = ["s3"] }