Got it - thanks! This is very helpful. We managed to generate the form
Weston suggested above (from a Python producer) and managed to get this to
work.
On Mon, Aug 7, 2023 at 2:45 PM Weston Pace wrote:
> > But I can't figure out how to express "select struct field 0 from field 2
> > of the
> But I can't figure out how to express "select struct field 0 from field 2
> of the original table where field 2 is a struct column"
>
> Any idea how the substrait message should look like for the above?
I believe it would be:
```
"expression": {
"selection": {
"direct_reference": {
