longest prefix match

[Dragan Zubac <zubac@xxxxxxxxx>]

Hello

Anybody got any ideas/experiences/links for 'longest prefix match' 
solution in PostgreSQL ?
Basically,put some telephone prefices in some kind of trie,and be able 
to perform fast lookups ?

Sincerely

Dragan Zubac

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TIP 9: In versions below 8.0, the planner will ignore your desire to
      choose an index scan if your joining column's datatypes do not
      match