Hi Erik,
Thanks for the response.
Consider the index in the back of a book. You could tear that out and
still use it to tell what page something is on, but you have no actual
content in hand.
So, I guess what I'm having a hard time trying to figure out is, what's the
point of having an index when you can't search/retrieve the contents of a
field in the index since it is not stored? Isn't the whole point of having
an index is to be able to search and retrieve the contents efficiently?
Basically I'm not sure the points of UnIndexed and UnStored fields types.
Say I use a field type "unindexed" for my SSN. I know its stored in the
index but how am I suppose to retrieve it?
As for the unstored, its like the scenario I described above... I see the
fields in the index but I won't be able to search/retrieve it since I don't
have the contents. The "text" field type makes sense to me (with data being
a String), as well as the type "keyword".
Is there a scenario or scenarios you can describe where Unindexed/Unstored
will be useful? Thanks in advanced!
-los
From: Erik Hatcher <[EMAIL PROTECTED]>
Reply-To: java-user@lucene.apache.org
To: java-user@lucene.apache.org
Subject: Re: lucene newbie question
Date: Mon, 2 Oct 2006 14:12:25 -0400
On Oct 2, 2006, at 2:08 PM, Los Morales wrote:
I'm new to Lucene and IR in general. I'm a bit confused on the concept
of fields. From what I've read, a field does not have to be indexed but
its value can be stored in an index. Likewise a field can be indexed but
its value is not stored in an index. Now how can a field be searchable
when its value is not stored in the index and vice-versa? Again, I'm new
to the Index/Search paradigm. Thanks in advanced.
Consider the index in the back of a book. You could tear that out and
still use it to tell what page something is on, but you have no actual
content in hand. When a field is tokenized (and therefore implicitly
indexed), it is run through the specified Analyzer and the terms emitted
are indexed, but the original text may or may not also be stored in the
index.
Make sense?
Erik
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