[PostGIS] #5775: ST_AsGeoJSONAgg which is aggregate version of ST_AsGeoJSON

[PostGIS]

#5775: ST_AsGeoJSONAgg which is aggregate version of ST_AsGeoJSON
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  Reporter:  robe     |      Owner:  pramsey
      Type:  defect   |     Status:  new
  Priority:  medium   |  Milestone:  PostGIS Fund Me
 Component:  postgis  |    Version:  master
Resolution:           |   Keywords:
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Comment (by mdavis):

 But I do see Paul's point that Postgres already has good support for
 converting rows to JSON, so this code would be duplicating that
 functionality.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5775#comment:6>
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