[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):

 The question is should we consider detoasting costs in the function
 definition or shouldn't we ?
 I'd think the planner should consider them itself as we cannot know its
 cost at definition time for two reasons:

  1. It depends on input (toast) size
  2. It depends on whether the input gets to us already detoasted

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Ticket URL: <http://trac.osgeo.org/postgis/ticket/2898#comment:7>
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