andygrove opened a new issue, #8602:
URL: https://github.com/apache/arrow-datafusion/issues/8602
### Describe the bug
I'm trying to regenerate protobuf source code by running `regen.sh` but it
fails with an error:
```
$ ./regen.sh
Finished dev [unoptimized + debuginfo] target(s) in 0.99s
Running `/home/andy/git/apache/arrow-datafusion/target/debug/gen`
Error: "protobuf compilation failed: protoc failed: datafusion.proto: This
file contains proto3 optional fields, but --experimental_allow_proto3_optional
was not set.\n"
```
I am using libprotoc 3.12.4 as suggested by the docs.
I see a comment in `datafusion.proto` ... `"optional" keyword is stable in
protoc 3.15`, so perhaps our docs are out of date and we now require 3.15? If
so, we should update the docs.
### To Reproduce
_No response_
### Expected behavior
_No response_
### Additional context
_No response_
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