[C++] Appveyor Build_Debug configuration is hanging in C++ unit tests

[asfimport]

Not sure which patch introduced this, but here is one master build where it occurs

https://ci.appveyor.com/project/ApacheSoftwareFoundation/arrow/builds/26413929/job/sws48m0603ujwya1

The commit before this patch seems to have been OK

Reporter: Wes McKinney / @wesm
Assignee: Antoine Pitrou / @pitrou

PRs and other links:

• GitHub Pull Request #5010

_{Note: This issue was originally created as ARROW-6108. Please see the migration documentation for further details.}

[asfimport]

Wes McKinney / @wesm:
This is really weird, so here's a passing appveyor build after ARROW-6061

https://ci.appveyor.com/project/ApacheSoftwareFoundation/arrow/builds/26404339

The very next patch ARROW-6068 hangs

https://ci.appveyor.com/project/ApacheSoftwareFoundation/arrow/builds/26413929/job/sws48m0603ujwya1

But this patch had a green build on Antoine's PR for ARROW-6068

https://ci.appveyor.com/project/ApacheSoftwareFoundation/arrow/builds/26399506

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Antoine Pitrou / @pitrou:
I cannot reproduce locally, will try to narrow down on AppVeyor...

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Antoine Pitrou / @pitrou:
Ok, I managed to diagnose using AppVeyor remote desktop. I should be able to push a fix soon.

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Antoine Pitrou / @pitrou:
The cause is explained in detail here: https://gerrit.libreoffice.org/#/c/54110/

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Wes McKinney / @wesm:
Issue resolved by pull request 5010
#5010

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Francois Saint-Jacques / @fsaintjacques:
WOW, we can RDP into appveyor!?! I think this debug session warrants a ML thread saying how you did this.

[asfimport]

Wes McKinney / @wesm:
https://www.appveyor.com/docs/how-to/rdp-to-build-worker/

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Francois Saint-Jacques / @fsaintjacques:
Not everyone will be reading this comment section, that was my intent of the ML thread.

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Wes McKinney / @wesm:
Agreed. Might want to add it to the documentation somewhere so it's more discoverable for new developers also