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From Chris Hostetter <>
Subject Re: add an "afterFilter" to
Date Tue, 29 Mar 2011 00:10:54 GMT

: > Optimizing cases where filters might be more expensive than the main query ;-)

: But you must have a real use case... that inspired this idea?  Where
: are apps/Solr "typically" using such expensive filters?

i have no idea what usecase prompted yonik to start thinking about this, 
but the first example that came up in my mind is the semi-ubiquitous 'ACL' 
question that people always want to implement using a completley 
external authorization system.

If you have no choice but to query an remote system to find out if a 
document should be included in a particular result set, odds are you don't 
want to pay the price of asking it only to find out afterwards that it 
doesn't matter anyway, because it doesn't metch a required query clause.


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