peter-toth commented on issue #9457:
URL:
https://github.com/apache/arrow-datafusion/issues/9457#issuecomment-1978364210
I was thinking of a macro that accepts a sequence of expressions and their
transformations:
```
let t = transform_siblings!(
expr, |e| transform_option_box(e, &mut f),
when_then_expr, |wte| wte.into_iter().map_until_stop_and_collect(|(when,
then)| {
transform_siblings!(
when, |w| transform_box(w, &mut f),
then, |t| transform_box(t, &mut f),
),
}),
else_expr, |ee| transform_option_box(ee, &mut f)
)
t.update_data(|(new_expr, new_when_then_expr, new_else_expr)| {
Expr::Case(Case::new(new_expr, new_when_then_expr, new_else_expr))
})
```
Inside the macro we can build up the same `update_data` +
`try_transform_node ` chain or maybe avoid that to make it easier to debug.
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