Add minimal support for querying multiple catalogs

[AlexandreOuellet]

This adds the catalog names in front of fields and table when needed. It will most likely require more finetuning but is a working prototype

[VinceDPM]

We're interested in this feature being integrated into a future release of PyHive. Is there any reason (besides failed travis CI) that the PR was never approved?

[AlexandreOuellet]

To be honest, I made this for work, created the PR and forgot about it. I can have a quick look to make it pass the flake8 issues

[codecov]

Codecov Report

❌ Patch coverage is 54.83871% with 14 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (master@d19cb0c). Learn more about missing BASE report.
⚠️ Report is 33 commits behind head on master.

Files with missing lines	Patch %	Lines
pyhive/sqlalchemy_presto.py	55.55%	5 Missing and 3 partials ⚠️
pyhive/presto.py	53.84%	4 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #246   +/-   ##
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  Coverage          ?   92.46%           
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  Files             ?       14           
  Lines             ?     1553           
  Branches          ?      170           
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  Hits              ?     1436           
  Misses            ?       84           
  Partials          ?       33           

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[AlexandreOuellet]

This is as far as I can get tonight. It's alright with python 3.6, but fails with 3.5, 3.4 and 2.7. Feel free to fork off of my branch if you want to contribute to it.

[VinceDPM]

Thanks, I found a similar str bug and made a PR against your branch that fixes the build for python 3.4/5, and added fix for python 2.7 syntax.

[bkyryliuk]

It would be great to see the examples on how would it behave & add some unit tests

[cerodav]

Hi Could you give an example on how to create the engine and query multiple catalgoues ?

[laserkaplan]

I noticed that this repo currently says it's unsupported, but is there any way we would be able to get this PR merged and into another release? I also now have the need for the functionality here. Happy to help implement whatever tests are required to get this through.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
0 out of 3 committers have signed the CLA.

❌ Aleandre Ouellet
❌ AlexandreOuellet
❌ VinceDPM

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