[Xapian-tickets] [Xapian] #181: Optional Termlist Table

[Xapian]

#181: Optional Termlist Table
---------------------------+------------------------------------------------
 Reporter:  olly           |        Owner:  olly     
     Type:  enhancement    |       Status:  assigned 
 Priority:  normal         |    Milestone:  1.1.4    
Component:  Backend-Chert  |      Version:  SVN trunk
 Severity:  minor          |   Resolution:           
 Keywords:                 |    Blockedby:  363      
 Platform:  All            |     Blocking:           
---------------------------+------------------------------------------------
Description changed by olly:

Old description:

> The termlist table should be optional - without it, documents can't be
> deleted or replaced, and query expansion couldn't work, but most other
> things could be made to work.
>
> Things which will now work:
>
>  - Database::alldocs_begin() - no longer uses the termlist.
>  - Database::get_doclength() - uses the document lengths stored in the
> postlist.
>
> Things which currently use it:
>
>  - Determining the percentage scores when the top document doesn't match
> all the query terms.
>
> Things which wouldn't work:
>
>  - WritableDatabase::delete_document()
>  - WritableDatabase::replace_document() if the document exists already.
>  - Database::termlist_begin()
>  - Document::termlist_begin()
>  - Document::termlist_count()
>  - Enquire::get_eset()

New description:

 The termlist table should be optional - without it, documents can't be
 deleted or replaced, and query expansion couldn't work, but most other
 things could be made to work.

 Things which will now work:

  - Database::alldocs_begin() - no longer uses the termlist.
  - Database::get_doclength() - uses the document lengths stored in the
 postlist.

 Things which currently use it:

  - Determining the percentage scores when the top document doesn't match
 all the query terms (see #363).

 Things which wouldn't work:

  - WritableDatabase::delete_document()
  - WritableDatabase::replace_document() if the document exists already.
  - Database::termlist_begin()
  - Document::termlist_begin()
  - Document::termlist_count()
  - Enquire::get_eset()

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Ticket URL: <http://trac.xapian.org/ticket/181#comment:13>
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