[postgis-users] Add feature id to MVT encoded features

[Nikolai Bezdna]

Hello,

I’d like to have a feature id in every feature that was encoded to MVT.
Currently st_asmvt doesn’t have an option to specify a column as a source for feature ids.

According to MVT spec:
https://github.com/mapbox/vector-tile-spec/tree/master/2.1#42-features <https://github.com/mapbox/vector-tile-spec/tree/master/2.1#42-features>
id is an optional property. 
While it’s extremely useful for client-side logic, it’d be great to have such an argument in st_asmvt function.
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