Version 0.6.3 is broken if you don't already have sqlalchemy installed

[scottbelden]

With a fresh python environment, if you do pip install pydruid and then do python -c "from pydruid.db import connect" you get ModuleNotFoundError: No module named 'sqlalchemy'.

This is because sqlalchemy is not a required dependency (only an extra):

pydruid/setup.py

Lines 7 to 12 in 893506b

	extras_require = {
	"pandas": ["pandas"],
	"async": ["tornado"],
	"sqlalchemy": ["sqlalchemy"],
	"cli": ["pygments", "prompt_toolkit>=2.0.0", "tabulate"],
	}

However, pydruid.db.exceptions does an import of it without checking if it is installed:

pydruid/pydruid/db/exceptions.py

Line 1 in 893506b

from sqlalchemy.exc import CompileError