This PR allow querying Google spreadsheets via SQL Alchemy, using a new module called [gsheetsdb](https://github.com/betodealmeida/gsheets-db-api).
 It works, but requires pushing some fixes upstream to `moz-sql-parser`. [ Full content available at: https://github.com/apache/incubator-superset/pull/5915 ] This message was relayed via gitbox.apache.org for [email protected]
