kou opened a new pull request, #44099:
URL: https://github.com/apache/arrow/pull/44099
### Rationale for this change
If we enable C++, Java and Rust, we use the following patterns:
| Producer | Consumer |
|----------|----------|
| C++ | C++ |
| C++ | Java |
| C++ | Rust |
| Java | C++ |
| Java | Java |
| Java | Rust |
| Rust | C++ |
| Rust | Java |
| Rust | Rust |
In apache/arrow, the following patterns are redundant because they should be
done in apache/arrow-rs:
| Producer | Consumer |
|----------|----------|
| Rust | Rust |
In apache/arror-rs, the following patterns are redundant because they should
be done in apache/arrow:
| Producer | Consumer |
|----------|----------|
| C++ | C++ |
| C++ | Java |
| Java | C++ |
| Java | Java |
### What changes are included in this PR?
Add `--target-language` option. We can specify target languages by this. (We
can specify `--target-language` multiple times.) Here are expected usages:
In apache/arrow:
* `--target-language=cpp`
* `--target-language=csharp`
* `--target-language=go`
* `--target-language=java`
* `--target-language=js`
In apache/arrow-rs
* `--target-language=rust`
Here is an example in apache/arrow-rs:
T: Languages specified by `--target-language`
* rust O: Languages not specified by `--target-language`
* cpp
* csharp
* go
* java
* js
* nanoarrow
Used matrix:
| Producer | Consumer |
|----------|----------|
| Rust | Rust |
| Rust | C++ |
| Rust | C# |
| Rust | Go |
| Rust | Java |
| Rust | JS |
| Rust | nanoarrow|
| C++ | Rust |
| C# | Rust |
| Go | Rust |
| Java | Rust |
| JS | Rust |
| nanoarrow| Rust |
If no `--target-language` is specified, all enabled languages are the target
languages. (The same as the current behavior.)
### Are these changes tested?
Yes.
### Are there any user-facing changes?
No.
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