[Tile-serving] [osm2pgsql-dev/osm2pgsql] Point along line like the "centroid" of a linestring (Discussion #2469)

[Jochen Topf]

There is already a change in master that [allows getting any of the nodes in a way as point](47938815da5ae734d113d7fb62af64fbb85bfd80). That's not exactly what you are asking for, but in most cases I have seen the only issue is really to get any point on the line as a "representative" of that line, no matter which point it is exactly. So this might already solve your problem. A [LineInterpolatePoint](https://postgis.net/docs/manual-3.5/ST_LineInterpolatePoint.html) function might still be useful though.

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