alamb commented on issue #9672:
URL:
https://github.com/apache/arrow-datafusion/issues/9672#issuecomment-2016581536
> Do you mean using the with_column method in DF? I think that doesn't make
sense, and it can only add existing column by adding projection. 🤔
As you point out, DataFusion's dataframe can already add a new column as a
derived expression (by using `project`).
What it can't do is append a new column to an existing DataFrame:
```rust
// Read 100 rows in
let df = ctx.read_csv("tests/data/example.csv",
CsvReadOptions::new()).await?;
// Create a new column with 100 integers
let new_column = RecordBatch::try_from_iter(vec![
("foo", Arc::new(Int32Array::from(0..100)))
]).unwrap();
// Append the new column to the dataframe
// (errors if the row counts don't match)
let df = df.append_column(new_column).await?
```
However, I am not sure how useful this feature would be
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