I just did a random "Calcite" search on upwork.com and it turned out
there's a research job to apply Calcite to a real project.
>Work on a 5-7 week PoC to use Apache Calcite (or other tools proposed)
>to map between a Legacy and Target SQL Server data model.
>The "Database Intermediary" would receive statements (CRUD)
>from the client Java application and transform the statement
>on the fly to the statement(s) required to update the SQL Server
>database according to the Target data model
Great work, everybody!
PS. Feel free to apply for the project. I would consider participating
provided I had more spare time.