Dandandan opened a new issue, #24085:
URL: https://github.com/apache/datafusion/issues/24085
### Describe the bug
`MemorySourceConfig`'s projection is `Option<Vec<usize>>` but is encoded as
a bare `repeated uint32`:
```rust
// encode
let proto_projection =
source_conf.projection().as_ref().map_or_else(Vec::new, |v| ...);
// decode
let projection = if !scan.projection.is_empty() { Some(...) } else { None };
```
So `Some(vec![])` — project away every column — serializes exactly like
`None` and always decodes back as `None`, and the decoded scan reports every
column again.
### To Reproduce
_No response_
### Expected behavior
_No response_
### Additional context
_No response_
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