timsaucer opened a new issue, #11982:
URL: https://github.com/apache/datafusion/issues/11982
### Describe the bug
When using a window function, you get an additional projection that is not
expected.
### To Reproduce
```
let schema = Schema::new(vec![
Field::new("a", DataType::Int32, true),
]);
let batch = RecordBatch::try_new(
Arc::new(schema.clone()),
vec![
Arc::new(Int32Array::from(vec![1, 2, 3, 4, 5])),
],
)?;
let ctx = SessionContext::new();
let provider = MemTable::try_new(Arc::new(schema), vec![vec![batch]])?;
ctx.register_table("t", Arc::new(provider))?;
let df = ctx.table("t").await?;
let func = Expr::WindowFunction(WindowFunction::new(
WindowFunctionDefinition::BuiltInWindowFunction(BuiltInWindowFunction::RowNumber),
vec![],
)).alias("row_num");
df.clone().select(vec![col("a"), func.clone()])?.show().await?;
df.with_column("r", func)?.show().await?;
```
### Expected behavior
When using the `select()` operation you get the desired result:
```
+---+---------+
| a | row_num |
+---+---------+
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 4 |
| 5 | 5 |
+---+---------+
```
But when using `with_column()` you get this additional projection:
```
+---+-----------------------------------------------------------------------+---+
| a | ROW_NUMBER() ROWS BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING
| r |
+---+-----------------------------------------------------------------------+---+
| 1 | 1
| 1 |
| 2 | 2
| 2 |
| 3 | 3
| 3 |
| 4 | 4
| 4 |
| 5 | 5
| 5 |
+---+-----------------------------------------------------------------------+---+
```
### Additional context
_No response_
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