[postgis-tickets] [PostGIS] #2898: Define a guideline for function cost

[PostGIS]

#2898: Define a guideline for function cost
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 Reporter:  strk         |       Owner:  pramsey      
     Type:  enhancement  |      Status:  new          
 Priority:  medium       |   Milestone:  PostGIS 2.2.0
Component:  postgis      |     Version:  trunk        
 Keywords:               |  
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Comment(by strk):

 17:37 < RhodiumToad> the planner doesn't take it into account.
 17:38 < RhodiumToad> currently, functions that may be highly expensive due
 to detoasting (to_tsvector being a notorious example) often need to be
 assigned large costs to avoid bad plans

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Ticket URL: <http://trac.osgeo.org/postgis/ticket/2898#comment:5>
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