5 feb 2009 kl. 09.30 skrev Amin Mohammed-Coleman:
Is there a seperate part in the lucene document that the tokenised
strings
are stored and therefore Lucene knows where to look?
Yes.
Stored fields is meta data bound to a document, for instance the
primary key of the object the Lucene document represents. Note that I
call this meta data, it is not the data Lucene looks at when searching.
In order to collect a list of documents matching a query Lucene
navigates an inverted index of string tokens. Usually each word in a
string is made in to a token, but there are many other strategies. (A
token is known as a term when associated with a specific field name.)
You might want to take a look at this:
http://en.wikipedia.org/wiki/Inverted_index
There is a third way Lucene stores data, the so called term vector
view. This is a cache of the terms available in a document, available
as it is very expensive for an inverted index to extract the terms
available in a document.
karl
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