Yes, Lucene supports multiple instances of same-named fields. There
is one trick you'll need to leverage for the proximity operators to
work as you expect - positionIncrementGap.
For example, if you index "Doe, John" and "Smith, Fred" as separate
name field instances on the same document, a phrase query for
name:"john smith" would match that document. Setting the position
increment gap to something greater than your desired phrase slop
would prevent this.
Erik
On Feb 3, 2008, at 4:14 PM, André Warnier wrote:
Hi.
I am totally new to Lucene, and currently investigating the usage of
Lucene for a new development project. In fact, for evaluation I am
using
the C port of Lucene, through the Perl "Lucene" module. I believe my
question is generic, but please tell me if it is otherwise.
(Please adapt this question to the Java environment if needed, want I
want to know is the fundamentals of Lucene)
In perl, to add items to the Lucene index, I do sonething like
my $doc = new Lucene::document;
$doc->addfield('title','value1');
$doc->addfield('author','value2');
$doc->addfield('subject','value3');
$lucene_writer->addDocument($doc);
and that works fine.
Now my question is : can I have seperate "instances" of the field
'author' in the same document, like
'author' = 'Einstein, Albert'
'author' = 'Newton, Isaac'
'author' = 'Freud, Sigmund'
Could I just do several times
$doc->addfield('author','name');
and would Lucene index separate "instances" of this field for the same
document ?
The reason being that I would like to search something like "Einstein
Albert"~1 (adjacent), but without finding another document which
would
have a concatenated field like "Thomas, Albert; Einstein, Joseph".
(The same case occurs for instance for a field "keywords".)
Does this question make sense with Lucene ?
If the above is not possible, then is this type of case usually
handled
otherwise in Lucene, and how ?
Thank you in advance,
aw
