[Tile-serving] [openstreetmap/osm2pgsql] Add geometry_n() function to get the nth geometry of a multi geometry (PR #1735)

[Jochen Topf]

You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/1735

-- Commit Summary --

  * Add geometry_n() function to get the nth geometry of a multi geometry

-- File Changes --

    M src/geom-functions.cpp (55)
    M src/geom-functions.hpp (24)
    M tests/test-geom-collections.cpp (5)
    M tests/test-geom-linestrings.cpp (1)
    M tests/test-geom-multilinestrings.cpp (2)
    M tests/test-geom-multipoints.cpp (10)
    M tests/test-geom-multipolygons.cpp (3)
    M tests/test-geom-null.cpp (1)
    M tests/test-geom-points.cpp (1)
    M tests/test-geom-polygons.cpp (1)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/1735.patch
https://github.com/openstreetmap/osm2pgsql/pull/1735.diff

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