timsaucer commented on PR #6746:
URL: https://github.com/apache/datafusion/pull/6746#issuecomment-2090457500
As a new user, I like this change very much. I found creating lead and lag
functions to be difficult to use. Suppose I wanted to call lead but provide the
other two optional arguments - shift offset and default value. Would the best
way to do that with this proposal to create the `WindowFunction` directly?
```
let single_lead = lead(col("mycol"));
let two_lead_with_default =
expr::WindowFunction::new(BuiltInWindowFunction::Lead, vec![col("mycol"),
lit(2), lit(mydefault)]);
```
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