sqlalchemy support

[dwa]

This is cleaned up code developed at tobii.com (in collaboration with
knowit.se), which we use to connect from Superset (http://airbnb.io/superset/,
apache/superset#2531) to an Athena DB.

Usage:
athena://:@athena.us-east-1.amazonaws.com/?region_name=&s3_staging_dir=s3%3A//<staging_bucket_of_choice>

[dwa]

Forgot to mention:

• That it is based on https://github.com/dropbox/PyHive/blob/master/pyhive/sqlalchemy_presto.py
• With some changes and inspiration has been taken from https://github.com/cloudera/impyla/blob/master/impala/sqlalchemy.py

[laughingman7743]

Thanks PR!

I would like you to write a test. PyAthenaJDBC's test uses pytest.
I think that the following PyHive's test will be helpful.

https://github.com/dropbox/PyHive/blob/master/pyhive/tests/sqlalchemy_test_case.py
https://github.com/dropbox/PyHive/blob/master/pyhive/tests/test_sqlalchemy_presto.py

PyAthenaJDBC's test also refers to PyHive's test.
Thanks,

[dwa]

Given the work on #14, are you still interested in this? Shall I work on some tests for this?

[laughingman7743]

Sorry, you do not need to write a test.
If you are interested in my implementation supporting SQLAlchemy, please connect to Superset with the following pull request branch.

#14

I do not use Superset, so I do not know if I can connect to Superset with my current implementation.
The connection string of SQLAlchemy is as follows. (Do not forget to quote access_key, secret_key and s3_staging_dir)

awsathena+jdbc://{access_key}:{secret_key}@athena.{region_name}.amazonaws.com:443/{schema_name}?s3_staging_dir={s3_staging_dir}&driver_path={driver_path}&...

Thanks,