adriangb opened a new issue, #13270:
URL: https://github.com/apache/datafusion/issues/13270
### Describe the bug
With CSV:
```shell
echo "a,b\n1,2" > data1.csv
mkdir a=2
echo "b\n3" > a=2/data2.csv
datafusion-cli
> SELECT * FROM '**/*.csv';
Arrow error: Csv error: incorrect number of fields for line 1, expected 2
got 1
```
With Parquet:
```python
import os
import polars as pl
pl.DataFrame({'a': [1], 'b': [2]}).write_parquet('data1.parquet')
os.mkdir('a=2')
pl.DataFrame({'b': [3]}).write_parquet('a=2/data2.parquet')
```
```shell
datafusion-cli
> SELECT * FROM '**/*.parquet';
+---+---+
| b | a |
+---+---+
| 2 | 1 |
| 3 | |
+---+---+
2 row(s) fetched.
Elapsed 0.055 seconds.
```
### To Reproduce
_No response_
### Expected behavior
Partition evolution is handled and both cases return
```
+---+---+
| b | a |
+---+---+
| 2 | 1 |
| 3 | 2 |
+---+---+
```
### Additional context
Having played around quite a bit with ParquetExec and the SchemaAdapter
machinery I think what should happen is:
- Partition values are on a per-file basis, in particular on each
`PartitionedFile` and not on the `FileScanConfig`
- Partition values are passed into the SchemaAdapter machinery and for each
file it decides if it needs to add a column generated from partition values or
not
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