Sven R. Kunze schrieb am 26.02.2015 um 12:04:
> I just thought about btree indexes here mainly because they well-known and 
> well-used in ORM frameworks. 

If your ORM framework needs to know about the internals of an index definition 
or even requires a certain index type, then you should ditch that ORM framework.

Apart from indexes supporting business constraints (e.g. a unique index) 
neither the application nor the the ORM framework should care about indexes at 
all.

> does PostgreSQL support the concept of reverse key indexing as described 
> here? 

The real question is: why do you think you need such an index? 
Do you have any performance problems with the existing BTree index? If yes, 
which problem exactly? 

Thomas





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