[Xapian-tickets] [Xapian] #442: Add support for mapping field names to differing term prefixes across multiple databases

[Xapian]

#442: Add support for mapping field names to differing term prefixes across
multiple databases
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 Reporter:  richard      |        Owner:  olly     
     Type:  enhancement  |       Status:  closed   
 Priority:  normal       |    Milestone:  1.2.x    
Component:  Library API  |      Version:  SVN trunk
 Severity:  normal       |   Resolution:  wontfix  
 Keywords:               |    Blockedby:           
 Platform:  All          |     Blocking:           
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Changes (by olly):

  * status:  new => closed
  * resolution:  => wontfix


Comment:

 This still seems like it would be opening a can of worms, even 2 years
 later.  There are likely
 to be a lot of awkward issues to resolve - e.g. I can see the ordering of
 converted terms being interesting.

 Although we don't have the B-tree key prefix compression completed yet, I
 think that's a better way to expend implementation effort - it also would
 reduce database size significantly in general, and that would add
 complexity only to the lower levels of the backend code, rather than
 touching a lot of areas of the code, and it wouldn't require any user API
 additions.

 Yes, that's ''"relying on as-yet unimplemented and unproven database
 storage improvements"'',
 but then the approach proposed here is relying on as-yet unimplemented and
 unproven changes
 to how Xapian maps terms to keys in databases.

 If we're going to decouple the field and the term rather than adding a
 prefix like we currently
 do, let's do it properly and make the appropriate API changes.  This
 probably won't be fully
 backwardly compatible, but we can make this change in Xapian 2.0.

 So I'm going to mark this idea as "won't fix".

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Ticket URL: <http://trac.xapian.org/ticket/442#comment:2>
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