[Tile-serving] [openstreetmap/osm2pgsql] Flex backend: hstore column for all flex tables (#1109)

[Sarah Hoffmann]

I don't follow. I thought your argument was to get more flexibility on the SQL side. I think it is save to assume that people who are able to formulate complicated SQL queries over hstore columns are able to change a Lua script to add a hstore column.

If the argument is ease-of-use, then there is always the C transform, which includes the hstore capability. We have no plans to retire the simple C transform. It might morph into a pre-written Lua script file but that would be a mere implementation detail. The user-side-facing behaviour as is not going to change. You can use this if you are uncomfortable with Lua.

We are surely not going to add lots of behaviour-changing switches to the flex backend if the same behaviour can easily be achieved by adding a minimal amount of Lua code. The goal was to get away from those switches because they are difficult to understand and tend to have badly specified side effects on each other.

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