Function datafusion_physical_expr::datetime_expressions::make_now

pub fn make_now(
    now_ts: DateTime<Utc>
) -> impl Fn(&[ColumnarValue]) -> Result<ColumnarValue>

Create an implementation of now() that always returns the specified timestamp.

The semantics of now() require it to return the same value wherever it appears within a single statement. This value is chosen during planning time.