[Tile-serving] [osm2pgsql-dev/osm2pgsql] Add tile-based generalizer calling SQL commands (PR #2181)

[Jochen Topf]

> What is this strategy used for that the others do not do?

It allows all strategies that can be implemented in SQL. It can also be used as an experimenting ground for new strategies that get later implemented in C++ for performance.

> Is it possible to make vector-union a special case of tile-sql?

Yes, that should be possible. I am undeciced on whether we want to have specialized code for stuff like vector-union to make usage simpler than with a generic mechanism implemented in this commit. We'll see how it goes. The generalization stuff is still marked as experimental, so I want to allow more experimentation at the moment.

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