phillipleblanc commented on issue #15173:
URL: https://github.com/apache/datafusion/issues/15173#issuecomment-2849049906
> And then making another stream wrapper that did the projecting
Actually, yeah - that would work quite nicely I think. If we changed
FileStream's interface from returning RecordBatches to returning a Tuple of
(RecordBatch, ObjectMeta) then it solves both cases.
i.e. from:
```rust
impl Stream for FileStream {
type Item = Result<RecordBatch>;
```
to
```rust
impl Stream for FileStream {
type Item = Result<(RecordBatch, ObjectMeta)>;
```
That would allow for injection of metadata columns in my custom
implementation and for parsing out of the partition column values from the
`location` in the ListingTableProvider (instead of having the inner FileStream
handle that complexity).
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