[postgis-tickets] [PostGIS] #4128: ST_AsMVT: add feature id support

[PostGIS]

#4128: ST_AsMVT: add feature id support
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 Reporter:  stepankuzmin  |      Owner:  pramsey
     Type:  defect        |     Status:  new
 Priority:  medium        |  Milestone:  PostGIS 2.5.0
Component:  postgis       |    Version:
 Keywords:                |
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 According to Vector Tile Specification v2.1 (https://github.com/mapbox
 /vector-tile-spec/tree/master/2.1#42-features):

 > A feature MAY contain an id field. If a feature has an id field, the
 value of the id SHOULD be unique among the features of the parent layer.

 But there is no way to set a feature id using `ST_AsMVT`.

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/4128>
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