jhorstmann commented on PR #8072:
URL: https://github.com/apache/arrow-rs/pull/8072#issuecomment-3165566978
> I'd like the resulting rust enums to use unit variants for the empty
structs just to cut down on code ugliness. I have a macro
`thrift_union_all_empty` that does what I want for enums with all unit variants.
Maybe the field type could be made optional in the macro definition like
this:
```
union LogicalType {
1: STRING // was StringType STRING
...
5: DecimalType DECIMAL // DecimalType contains scale and precision
}
```
But that looses the nice feature of being able to do a clean diff of
everything inside the macro against the actual thrift definitions from the
spec. I don't think a declarative macro could keep track that `StringType`
(which could be defined anywhere) was an empty struct. The issue is similar to
the one about lifetimes, ideally I'd want to generate a lifetime parameter if
any of the fields need one.
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