This is *not* another "How can I update an existing Document in a Lucene Index" question. I fully understand why "update" is not available, and why update == delete + re-insert.
My request is not for a "update document" feature, but a "add to document" feature.
What I would ideally be looking for is a method on IndexWriter like this:
public void addToExistingDocument(int docNum, Document doc) throws IOException
Consider this example usage:
----
Document doc1 = new Document();
doc1.add(Field.Keyword("f1", "john"));
Document doc2 = new Document();
doc2.add(Field.Keyword("f2", "doe"));IndexWriter w = ... w.addDocument(doc1); int docid = ... // compute docid of previous "add" w.addToExistingDocument(docid, doc2); ----
Doing a search that returned "docid" would result in a Document that contained two field/value pairs: "f1"/"john" and "f2"/"doe".
Firstly, I suspect that it is possible to implement addToExisitingDocument(): can anyone confirm or deny this? If it is possible, I'm happy to put my hand up for having a go at implementing it.
Why do I want this? I have an index of documents that contain a "primary key" and a whole bunch of other fields. However, I'm unable to collect all the fields in one pass. Infact, some of the field values actually depend on the results of a search over the "partial" documents! (This may sound wierd but I can explain the usecase if anyone wants to hear it.)
My current solution is to have multiple indexes; each "pass" inserts Documents into different indexes, where corresponding documents share the same "primary key". This is annoying, because queries that span fields from different passes require me to manually "merge" the results from seperate queries. (I "join" two Hits objects along the shared primary key; this is way slow as you might imagine.)
So, is this idea implementable? Any and all flamage welcome.
=Matt
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