I've been reading up on NUTCH-479 "Support for OR queries" but I must be
missing something obvious because I don't understand what the JIRA is about:
https://issues.apache.org/jira/browse/NUTCH-479
Description:
There have been many requests from users to extend Nutch query syntax
to add support for OR queries,
in addition to the implicit AND and NOT
queries supported now.
Ok, so I guess what I don't understand is what is the "Nutch query syntax"?
The main discussion I found on nutch-user is this:
http://osdir.com/ml/search.nutch.devel/2004-02/msg00007.html
I was wondering why the query syntax is so limited.
There are no OR queries, there are no fielded queries,
or fuzzy, or approximate... Why? The underlying index
supports all these operations.
I notice by looking at the or.patch file
(https://issues.apache.org/jira/secure/attachment/12360659/or.patch) that one
of the programs under consideration is:
nutch/searcher/Query.java
The code for this is distinct from
lucene/search/Query.java
It looks like this is an architecture issue that I don't understand. If nutch
is an "extension" of lucene, why does it define a different Query class? Why
don't we just use the Lucene code to query the indexes? Does this have
something to do with the nutch webapp (nutch.war)? What is the historical
genesis of this issue (or is that even relevant)?
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