Support optional fields

[fdymylja]

The plugin currently does not support optional fields:

testpb/1.proto: is a proto3 file that contains optional fields, but code generator protoc-gen-go-fasteflection hasn't been updated to support optional fields in proto3.

[technicallyty]

it works in the main branch, but you need to pass --experimental_allow_proto3_optional

[technicallyty]

iceboxing this as we are not planning to support optional fields at this time

[aaronc]

I think it's worth reopening this as I'm seeing some use cases for optional fields. How hard do you think it will be to add?

[aaronc]

Btw, pulsar codegen does not fail for me and generates the expected *int32 pointer type. But build does fail:

regen/ecocredit/curation/v1beta1/state.pulsar.go:662:6: x.XMin undefined (type *fastReflection_NumericAttributeDefinition has no field or method XMin)
regen/ecocredit/curation/v1beta1/state.pulsar.go:663:16: x.XMin undefined (type *fastReflection_NumericAttributeDefinition has no field or method XMin)
regen/ecocredit/curation/v1beta1/state.pulsar.go:664:9: undefined: NumericAttributeDefinition_Min

[fdymylja]

It's complex due to presence semantics.

I will add it to the backlog, what is the priority?

[aaronc]

I would consider it low as I can make a work-around