alamb commented on issue #16991:
URL: https://github.com/apache/datafusion/issues/16991#issuecomment-3141439401
Thank you for bringing this up @EmilyMatt
I think there is currently an assumption in the `ListingTable` (and all the
way down to the DataSourceExec) that all the files are read from the same
underlying `ObjectStore` instance which I think is the root cause of the
challenge
It would be pretty disruptive (aka a big and complicated PR) I think to try
and wire in support for multiple object stores
Another idea I had work for you could be to make a "virtual" ObjectStore
wrapper
Something like this (a sketch, not compiling):
```rust
struct VirtualObjectStore {
// Maps the first element of each path to a different ObjectStore
stores: HashMap<String, Arc<dyn ObjectStore>>.
}
impl ObjectStore for VirtualObjectStore {
// delegates to the correct store
// for example,
// get '/store1/my_data/1.parquet'
// would be mapped to a get call to `store1` at path `/my_data/1.parquet`
fn get(&self, path: Path) -> ... {
let store = path[0]; // first part of the path
let real_path = path[1..]; // remainder of the path
// delegate to the inner store
self.stores.get(store).get(real_path)
}
...
}
```
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