Data Source Adapter for Google Sheets

A data source adapter is a feature that allows the ability to map existing data into schemas/tables of Polypheny, offering users the benefit of using query languages, analytical systems, and other features of the Polypheny database to act upon the data set. This project aims at building a data source adapter for Google Sheets, a common form of storing relational data in a collaborative and fast-paced environment, to improve the range of data systems Polypheny can interact with. To do this, the project consists of building a google-sheets-adapter package through the Google Sheets Java API, incorporating the adapter functionality to the Polypheny user interface, and adding thorough unit tests to ensure the quality of the package.