[Tile-serving] [openstreetmap/osm2pgsql] Adding User Defined Columns (#622)

[Paul Norman]

You can add a column to the tables and it will only be filled in if the tag transform returns a value for that column. If using hstore any tags from the transform without a column in the style file will go into hstore.

You don't want to do this because on update any information you have added will be lost. Instead, create a new table storing OSM ID and your properties and `LEFT JOIN` them together at query time, or something more sophisticated.

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