On Apr 6, 2006, at 8:47 AM, Michael Dodson wrote:
Can phrase queries be nested the same way boolean queries can be
nested?
Yes... using SpanNearQuery instead of PhraseQuery.
I want a user query to be translated into a boolean query (say, x
AND (y OR z)), and I want those terms to be within a certain
distance of each other (approximately within the same sentence, so
the slop would be about 7). I then want to find documents where
that phrase is within a certain distance of another term (in this
case an image name). So in pseudo code I would have something like
PhraseQuery query1
Set slop to 7
PhraseQuery query2
Set slop to 50
Add boolean terms to query1
Add query1 and imageName to query2
Search
I think I could break down my initial boolean query and turn query1
into two phrase queries which are OR'ed together (so have query1a
with "x AND y" with slop 7, and query1b with "x AND z" and slop 7,
both added to a BooleanQuery) but I still need to combine that
query with the image name in query2.
QueryParser itself does not support the SpanQuery family, but the
surround query parser (see contrib/surround in the codebase) does
using an alternate syntax. So depending on your needs, you may need
to create some sort of parser to allow humans to enter such queries.
Erik
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