[postgis-tickets] [PostGIS] #4695: ERROR: GetGenericCacheCollection: Could not find upper context ST_AsGeoJSON and pg13

[PostGIS]

#4695: ERROR:  GetGenericCacheCollection: Could not find upper context
ST_AsGeoJSON and pg13
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  Reporter:  robe     |      Owner:  pramsey
      Type:  defect   |     Status:  new
  Priority:  blocker  |  Milestone:  PostGIS 3.1.0
 Component:  postgis  |    Version:  master
Resolution:           |   Keywords:
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Comment (by Algunenano):

 > You think it might be related to there removal of stuff in 13 around
 heap/table

 No, it's related to the cache I added to ST_AsGeoJSON to limit the amount
 of accesses to spatial_ref_sys (ideally to do it just once per relation).

 The problem comes from the fact that we cache our stuff in the parent
 memory context, but when we use `DirectFunctionCall` we are calling it
 without declaring a parent, so it fails when trying to use the cache.

 I can reproduce it in PG12 with latest Postgis, so it should be an easy
 fix.

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/4695#comment:6>
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