[postgis-tickets] [PostGIS] #4615: Optimize lwout_geojson output

[PostGIS]

#4615: Optimize lwout_geojson output
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 Reporter:  Algunenano   |      Owner:  Algunenano
     Type:  enhancement  |     Status:  assigned
 Priority:  medium       |  Milestone:  PostGIS 3.1.0
Component:  postgis      |    Version:  master
 Keywords:               |
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 Related to ​https://trac.osgeo.org/postgis/ticket/4543

 After #4543 is applied, around half the time spent in the output of
 ST_AsGeoJSON of a big polygon (>100k vertices) is spent in sprintf calls,
 mainly calculating the length of the strings (which we already know). It
 should be possible to remove all this time by replacing it a memcpy calls
 or writting the doubles directly in the buffer (instead of writting them
 in an auxiliar variable and then into the buffer).

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/4615>
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