Martin Kleusberg 02db68107a Refactor the way we store a database schema ...

This commit does a lot of refactoring. But most noticeably it changes
two things:

1) Instead of saving all objects (tables, views, indices, triggers) of a
   schema in a common map, we now store tables/views, indices and
   triggers in three separate maps. This has a number of benefits:
   - It resembles more closely how SQLite stores its data internally and
     therefore achieves greater compatability e.g. for databases with a
     view and a trigger with the same name.
   - It reduces the need for runtime polymorphism. This makes the code
     run a bit faster.
   - By working with explicit types more often more error checking can
     be done at compile time, making the code less error prone.
   - The code becomes a lot clearer to read.

2) By making View inherit form Table, views are now a sort of tables.
   This has the following benefits:
   - This is a again how SQLite stores views internally which again
     should increase compatibility a bit.
   - We mostly treat views and tables the same anyway and with these
     changes we can unify the code for them even more.

2021-01-30 20:47:31 +01:00

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