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From Josh Devins <j...@amenhq.com>
Subject Filter and query precedence, boolean query
Date Sun, 23 Oct 2011 15:39:20 GMT
Hi folks,

I'm hoping someone can shed some light on how filters and boolean queries
work under the hood. As I understand it, the following two queries are
functionally equivalent:

boolean must, term query: foo, boolean must, term query: bar
term query: foo, term filter: bar

What I'd like to understand is:

1) How are boolean queries run by Lucene? Are both queries (term query: foo,
term query: bar) run and then set operation intersection performed to find
the final document set? Or is it a staged query where term query: foo runs
first, then term query: bar run on the subset returned from the first query
for foo?

2) When running the above query+filter, which is run first? Specifically, if
documents with the term 'foo' are an order of magnitude larger than the
documents with the term 'bar', should they be swapped in the above query so
that the results of the query are as small as possible before running the
filter. Or does the query run against the results of the filter?

Hopefully this make sense :)

Thanks,

Josh

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