ARROW-6972: [C#] Support for StructArrays

[pgovind]

Fix for https://issues.apache.org/jira/browse/ARROW-6972

Add support for StructArray. It'd be nice to have an easier way to construct a StructArray, but that can come in a follow up PR.

cc @eerhardt @nealrichardson
Not sure who else works on the C# parts of the repo.

[github-actions]

Thanks for opening a pull request!

Could you open an issue for this pull request on JIRA?
https://issues.apache.org/jira/browse/ARROW

Then could you also rename pull request title in the following format?

ARROW-${JIRA_ID}: [${COMPONENT}] ${SUMMARY}

See also:

• Other pull requests
• Contribution Guidelines - How to contribute patches

[github-actions]

https://issues.apache.org/jira/browse/ARROW-6972

[eerhardt]

This is looking really good. Thanks for the quick turnaround on this.

[eerhardt]

LGTM. Thanks @pgovind for getting this feature in.

I'll merge this early tomorrow if there is no more feedback.

[eerhardt]

@kou @nealrichardson - do you know why the assign-rust-labels job failed?

1s
Run actions/[email protected]
  with:
    repo-token: ***
    configuration-path: .github/workflows/dev_labeler/labeler.yml
    sync-labels: true
Error: TypeError: glob pattern string required
Error: glob pattern string required

[nealrichardson]

@eerhardt I haven't looked but I think the authors of that new workflow are working to fix it. You can ignore it.