mbwhite opened a new issue, #13645:
URL: https://github.com/apache/datafusion/issues/13645
### Describe the bug
The FieldReference in Substrait is defined with `root_type` being `oneof`
```
message FieldReference {
// Whether this reference has an origin of a root struct or is based on
the
// ouput of an expression. When this is a RootReference and
direct_reference
// above is used, the direct_reference must be of a type StructField.
oneof root_type {
Expression expression = 3;
RootReference root_reference = 4;
OuterReference outer_reference = 5;
}
```
A `RootReference` message is defined, that is empty but is used in most
cases I've seen.
The code [here]
(https://github.com/apache/datafusion/blob/fdb221fa645359b4bb65f600db1997ad6c865b65/datafusion/substrait/src/logical_plan/producer.rs#L2144)
sets this to `None`.
When this is serialized to a protobuf and read by other engines
(Substrait=Java in my case) this fails. with a
` Unhandled type: ROOTTYPE_NOT_SET`
### To Reproduce
Create a DataFusion plan, and then try and consume it within say
SubstraitJava
### Expected behavior
The protobuf should be valid and parse correctly
### Additional context
_No response_
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