[elephant-ticket] #38: Map over types

[elephant]

#38: Map over types
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 Reporter:  ieslick      |       Owner:  ieslick      
     Type:  enhancement  |      Status:  new          
 Priority:  minor        |   Milestone:  Release 0.8.0
Component:  db-bdb       |     Version:               
 Keywords:               |  
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 Right now there is no good way to map over types is a btree or index.
 There are two notions of types to think about: primitive serializer types
 (select by type tag) or lisp types (which requires deserializing all
 values).  The trick to lisp types is either to do a full scan with lisp
 subtypes, or to do a set/pset to the primitive supertype, then filter out
 the subtypes according to the type specifier.

 This might be put off until someone requests it as typically indexes are
 looking at ranges of

 Ideal implementation?  Only deserialize values if primitive types match -
 lazy deserialization is a general feature that might be nice.

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Ticket URL: <http://trac.common-lisp.net/elephant/ticket/38>
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