On Jan 9, 2007, at 10:24 PM, David wrote:
Hi all:
can we add duplicate field in Lucene like the following:
Yup, no problem!
doc.add(new Field("author", "author1", Field.Store.YES,
Field.Index.UN_TOKENIZED));
doc.add(new Field("author", "author2", Field.Store.YES,
Field.Index.UN_TOKENIZED));
How will Lucene act?
It'll be as if you did concatenate them yourself into a single field,
with a slight caveat. Multiple same-named fields can have a virtual
positional gap added to them (see the setPositionGap feature). This
can prevent phrases searching across instances of the field. For
example, if you indexed "Samual Clemens" and "Mark Twain" as two
separate "author" fields, but left the default position gap setting,
someone could query for "clemons twain" and get a hit as an exact
phrase match.
if I want add two authors to the index , how can I do? except
concat the
authors' string, because maybe I should support Range search for
datetime.
You'd do it just the way you're doing.
Erik
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