* Handle int64 columns with missing data in SQL Lab
* Fix docstring
* Add unit test
* Small fix
* Small fixes
* Fix cursor description update
* Better fix
* Fix unit test, black
* Fix nan comparison in unit test
* Add function to fix dataframe column case
* Fix broken handle_nulls method
* Add case sensitivity option to dedup
* Refactor function definition and call location
* Remove added blank line
* Move df column rename logit to db_engine_spec
* Remove redundant variable
* Update comments in db_engine_specs
* Tie df adjustment to db_engine_spec class attribute
* Fix dedup error
* Linting
* Check for db_engine_spec attribute prior to adjustment
* Rename case sensitivity flag
* Linting
* Remove function that was moved to db_engine_specs
* Get metrics names from utils
* Remove double import and rename dedup variable
* Improve database type inference
Python's DBAPI isn't super clear and homogeneous on the
cursor.description specification, and this PR attempts to improve
inferring the datatypes returned in the cursor.
This work started around Presto's TIMESTAMP type being mishandled as
string as the database driver (pyhive) returns it as a string. The work
here fixes this bug and does a better job at inferring MySQL and Presto types.
It also creates a new method in db_engine_specs allowing for other
databases engines to implement and become more precise on type-inference
as needed.
* Fixing tests
* Adressing comments
* Using infer_objects
* Removing faulty line
* Addressing PrestoSpec redundant method comment
* Fix rebase issue
* Fix tests
