Support writing parquet to stdout

[pacman82]

Is your feature request related to a problem or challenge? Please describe what you are trying to do.
A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
(This section helps Arrow developers understand the context and why for this feature, in addition to the what)

I would like to write parquet files to "true" streams. E.g. stdout. This is in the context of the downstream odbc2parquet tool, for which I would like provide the option. This would allow my users to stream the parquet directly into a key value store or other sink just using pipes in their shell.

Describe the solution you'd like
I would like to see the Seek + TryClone requirement dropped as a requirement to initialize a SerializedFileWriter. From what I've seen at least the Seek requirement is used to determine the length of the Metadata written into the stream. Or tracking stream position in general. I feel Seek is to strong a requirement to just keep track of a position, or bytes written.

Describe alternatives you've considered
I have not considered any alternatives. Happy to hear about them, though.

[alamb]

This may be related to some work @tustvold has planned for the parquet reader such as #1605

I haven't heard him discuss anything about the writer yet though

[tustvold]

As described in #937 it should be relatively straightforward to drop the seek requirement. A PR would be most welcome, otherwise I can try to take a stab when I have time

[pacman82]

Great. Sorry for missing the existing issue. I looked, but not thouroghly enough it seems. I also found it would be rather straight forward to drop it. Might become my first contribution, if I am not kept busy with issues on the downstream artefacts. My intention with this issue, was exactly to verify that such a PR indee would be welcome.

Thanks for the quick response!

[tustvold]

I'm currently working on this as part of fixing #1717

[pacman82]

@tustvold Great! This will unblock new features in downstream crate odbc2parqet. 🙇

[alamb]

Specifically, #1719 allows SerializedFileWriter to write to anything that implements std::io::Write as is common in the rust ecosystem 🎉

[pacman82]

This is great. I'm not sure what the etiquette here is. Am I supposed to close this issue, or do the maintainers do so? For me the change in signature is enough to verify that it solves my use-case.

[tustvold]

It will be closed automatically when #1719 is merged, which will hopefully be in the next few days. Going to leave it open for a bit to give other reviewers a chance to look over it

[alamb]

planned for release in 16.0.0 (eta early next week)