date window

[James O'Rourke <ja...@bittorrent.com>]

Hi All,

I've been thinking about this problem for some time now. I'm trying  
to figure out a way to store date windows in lucene so that I can  
easily filter as follows.

A particular document can have several date windows.
Give a specific date, only return those documents where that date  
falls within at least one of those windows.

 From what I can see, the only way I can think of doing it is to  
create a special field format and create a custom filter. The filter  
isn't that useful for caching though, because every query will have   
new date (essentially NOW())

Also, note that there are multiple windows here for a single  
document, we can't just search between min start and max end.

Ideas from those more familiar with lucene would be greatly appreciated.

James


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Re: date window

[Chris Hostetter <ho...@fucit.org>]

: A particular document can have several date windows.
: Give a specific date, only return those documents where that date
: falls within at least one of those windows.

: Also, note that there are multiple windows here for a single
: document, we can't just search between min start and max end.

This can tehoreticaly be done using a custom varient of
PhraseQuery and "parallel fields" where you have a range_start field and a
range_end field and the positions of the dates in each field "line up" so
that you can tell which start corrisponds with which end.

I mentioned this idea (which actual came from on off hand comment Doug
made about PhraseQuery at last year's ApacheCon US) in this Solr thread
when someone asked a similar question...

http://www.nabble.com/One-item%2C-multiple-fields%2C-and-range-queries-tf2969183.html#a8404600


..i have never tried implementing this in practice.

-Hoss


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