andygrove opened a new issue, #2870:
URL: https://github.com/apache/arrow-datafusion/issues/2870
**Is your feature request related to a problem or challenge? Please describe
what you are trying to do.**
When using the dataframe API there is no easy way to cast a column to
another type
**Describe the solution you'd like**
I would like a `cast` function something like this:
```rust
fn cast(expr: Expr, data_type: DataType) -> Expr {
Expr::Cast {
expr: Box::new(expr),
data_type,
}
}
```
This would allow me to then write dataframe code like this:
```rust
.with_column(
"unixReviewTimestamp",
cast(
col("unixReviewTime"),
DataType::Timestamp(TimeUnit::Millisecond, None),
),
)?
```
**Describe alternatives you've considered**
None
**Additional context**
None
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