: Am just trying to see if i understand the lucene query below correctly.
:
: +(+contentNew:radio +contentNew:mp3) +entity:product +(name:radio
: mp3^4.0 (contentNew:radio contentNew:mp3) contentNew:radio mp3^2.0)
:
: Let me see if can understand the above query correctly:
your interpretation isn't quite right -- you are assuming
phrases in cases where there aren't any. just because there is no field
name in front of a word, doesn't mean that word is a continuation of a
phrase from the previously mentioned field -- it is a term query on
whatever the default field for the index is.
think of your query as expressing...
REQUIRED:
REQUIRED: contentNew:radio w/score boost of 1.0
REQUIRED: contentNew:mp3 w/score boost of 1.0
REQUIRED: entitiy:product w/score boost of 1.0
REQUIRED:
SHOULD: name:radio w/score boost of 1.0
SHOULD: defaultField:mp3 w/score boost of 4.0
SHOULD:
SHOULD: contentNew:radio w/score boost of 1.0
SHOULD: contentNew:mp3 w/score boost of 1.0
SHOULD: contentNew:radio w/score boost of 1.0
SHOULD: defaultField:mp3 w/score boost of 2.0
if you want to ignore the scores, and just talk about what documents will
match, then it's simplified representation is ...
contentNew:radio AND contentNew:mp3 AND entitiy:product AND
(name:radio OR defaultField:mp3)
: (I am trying to understand the above query in terms of ANDs, ORs,
: Groupings and boosting as opposed to prohibited and required)
I would strongely recommend you embrace the idea of
prohibited/required/optional, it's a much more general way to think
about queries. Any query can be expressed in terms of nested
groupings of require, prohibited, and optional clauses -- But it's not
always possible to take a query and express it in simple AND/OR/NOT
boolean logic (which is one of the reasons why i had the fact that the
class is called "BooleanQuery")
Consider this query: foo:cat +bar:dog
...the closest boolean logic representation of this query that exists is:
bar:dog
ie, the only documents that contain the term bar:dog match -- but that
doesn't allow you to express the impacts of the foo:cat clause will have
on the scores of the documents.
-Hoss
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