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

[mboeringa]

That's fine, but I do have a few questions then:

- The [docs regarding the flex backend](https://github.com/openstreetmap/osm2pgsql/blob/master/docs/flex.md) show an example of adding an hstore column, but @joto says _"there is no sensible way to come up with a default fill"_. So what does this option do?

> -- definition of the table:
table_pois = osm2pgsql.define_node_table('pois', {
    { column = 'tags', type = 'hstore' },
    { column = 'name', type = 'text' },
    { column = 'geom', type = 'point' },
})

- Is the hstore column being indexed?
- More general, is any indexing taken care of in the flex backend, e.g. at the very least the geometry columns? I don't see anything mentioned about this in the documentation.

Thanks for any info you can share.

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