jayzhan211 commented on issue #10785:
URL: https://github.com/apache/datafusion/issues/10785#issuecomment-2148799000
`StateFieldsArgs ` can be constructed without AggregateFuncitonExpr.
This is how we calculate state fields.
```
fn state_fields(&self) -> Result<Vec<Field>> {
let args = StateFieldsArgs {
name: &self.name,
input_type: &self.input_type,
return_type: &self.data_type,
ordering_fields: &self.ordering_fields,
is_distinct: self.is_distinct,
};
self.fun.state_fields(args)
}
```
You can see `create_aggregate_expr` to know how these arguments are built.
If the functions does not event need `ordering_fields`, you can even set
ordering_fields to `&[]`
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