[Xapian-tickets] [Xapian] #198: Add support for multiple values in each value slot in a Document.

[Xapian]

#198: Add support for multiple values in each value slot in a Document.
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 Reporter:  richard        |        Owner:  richard  
     Type:  defect         |       Status:  assigned 
 Priority:  high           |    Milestone:  1.1.4    
Component:  Backend-Chert  |      Version:  SVN trunk
 Severity:  normal         |   Resolution:           
 Keywords:                 |    Blockedby:           
 Platform:  All            |     Blocking:  199      
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Comment(by richard):

 Oops, yes, !StringListSerialiser.

 You'd only need to use a Sorter for a value slot that you've stored
 multiple values in - I think wanting to sort on a field with multiple
 values is going to be quite rare (but could be wrong!).

 If you want to separate the storage of the first value from the subsequent
 values, you could do that by using one slot to store the first value (as a
 plain entry), and a second slot to hold the subsequent values (as a
 !StringListSerialised set of entries).

 I think the difference is about where the code complexity sits - I'm not
 sure that there's anything which needs to sit inside the innards of
 Xapian, so I'm thinking that we shouldn't make them more complex than we
 need to.

 Also, there's a question of implementation time - we have a
 StringListSerialiser implementation already that works (though could
 probably do with some API tidying), but we'd have to implement the
 multiple-value-in-a-slot storage mechaism, for each backend, which would
 be quite a bit of work.

 Perhaps we're going in circles a bit - we should probably discuss this on
 IRC instead.

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Ticket URL: <http://trac.xapian.org/ticket/198#comment:18>
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