alamb commented on issue #617:
URL:
https://github.com/apache/arrow-datafusion/issues/617#issuecomment-867817913
So at least initially the answer appears to be "I should be creating fully
qualified `Expr`s (with relation name)"
Here is the change I needed to make in IOx:
```rust
let exprs = input
.schema()
.fields()
.iter()
- .map(|field| logical_plan::col(field.name()))
+ .map(|field| Expr::Column(field.qualified_column()))
.collect::<Vec<_>>();
```
This was a non obvious failure more however, and I can probably figure out a
better way to detect such errors. Anyhow, closing for now
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