[C++][FS][Azure] Implement `DeleteFile()`

[kou]

Describe the enhancement requested

It's not implemented yet.

This is a child of GH-18014.

Component(s)

C++

[av8or1]

Take

[av8or1]

Tom, I have an initial implementation completed. However, I have concerns surrounding testing. Specifically:

1. How have other contributors been testing similar functionality?
2. Is there a scripted process that I can follow to replicate that testing?
3. I took a look at the azurefs_test.cc file and noted the modifications made to provide regression for similar functionality. However I am wondering what all use cases I would need to support for DeleteFile? I am not as familiar with this type of testing, as we do our own in-house stuff, but this seems straightforward enough.

Finally, I implemented this using DeleteIfExists() rather than Delete(), for I saw that the former method was used elsewhere in the Azure work. Any feedback regarding that choice?

[kou]

Tom, I have an initial implementation completed. However, I have concerns surrounding testing. Specifically:

Great! Could you open a draft PR for it?

1. How have other contributors been testing similar functionality?

I'm using ninja -C cpp.build debug/arrow-azurefs-test && LD_LIBRARY_PATH=$PWD/cpp.build/debug cpp.build/debug/arrow-azurefs-test. Here are some notes for the command line:

• I'm on Debian GNU/Linux
• I use cpp.build as my build directory for cpp/
• The current directory is the top directory of cloned apache/arrow

2. Is there a scripted process that I can follow to replicate that testing?

https://arrow.apache.org/docs/developers/cpp/development.html#running-unit-tests is the standard process but it runs all tests.

3. I took a look at the azurefs_test.cc file and noted the modifications made to provide regression for similar functionality. However I am wondering what all use cases I would need to support for DeleteFile? I am not as familiar with this type of testing, as we do our own in-house stuff, but this seems straightforward enough.

We can borrow test patterns from GCS's one for now: https://github.com/apache/arrow/blob/main/cpp/src/arrow/filesystem/gcsfs_test.cc

We'll use generic tests eventually after we implement all features: #39069

Finally, I implemented this using DeleteIfExists() rather than Delete(), for I saw that the former method was used elsewhere in the Azure work. Any feedback regarding that choice?

Let's discuss this on a draft PR.

[av8or1]

Thanks. I have opened a PR:
#39648

Note that this is my first attempt at the process of contributing to the Arrow library.