[postgis-tickets] [PostGIS] #4623: Optimize ST_AsBinary

[PostGIS]

#4623: Optimize ST_AsBinary
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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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 LWGEOM_asBinary calls `lwgeom_to_wkb` which does the task to serialize the
 geometry in the WKB format and then, to be able to output it as a datum,
 it needs to allocate another buffer and copy all the information there.

 I think this could benefit from a small change in lwgeom_to_wkb to return
 a Datum / varlena (or an equivalent liblwgeom type) directly. We already
 have `SIZE_SET` and `SIZE_GET` for gserialized operations and they could
 be reused here.

 This would only make sense if there was a noticeable impact in
 performance, which is what I intend to investigate in this issue.

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/4623>
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