[Tile-serving] [osm2pgsql-dev/osm2pgsql] Optionally build id index as unique index (PR #2170)

[Jochen Topf]

Specify with `create_index = 'unique'` in the `ids` field of the `define_table()` Lua function.

The user has to make sure not to insert multiple rows into such a table.

This can be useful if some program using the data has special handling for unique ids/primary keys, for instance when it needs unique ids to allow editing.
You can view, comment on, or merge this pull request online at:

  https://github.com/osm2pgsql-dev/osm2pgsql/pull/2170

-- Commit Summary --

  * Optionally build id index as unique index

-- File Changes --

    M src/flex-lua-table.cpp (3)
    M src/flex-table.cpp (3)
    M src/flex-table.hpp (13)

-- Patch Links --

https://github.com/osm2pgsql-dev/osm2pgsql/pull/2170.patch
https://github.com/osm2pgsql-dev/osm2pgsql/pull/2170.diff

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