There is special handling build into Solr (but not Lucene I don't think)
that deals with the reversed case, that's probably the source of your
differences.
Leading wildcards are extremely painful if you don't do some trick
like Solr does with the reversed stuff. In order to run, you have to
spin through _every_ term in the field to see which ones match. It
won't be performant on any very large index.
So I would stick with using the Solr stuff unless you have a specific
need to do things at the Lucene level. In which case I'd look carefully
at the Solr implementation to see what I could glean from that
implementation.
Best
Erick
On Thu, Apr 12, 2012 at 8:01 AM, neosky neosk...@yahoo.com wrote:
I ask the question in
http://lucene.472066.n3.nabble.com/A-little-onfusion-with-maxPosAsterisk-tt3889226.html
However, when I do some implementation, I get a further questions.
1. Suppose I don't use ReversedWildcardFilterFactory in the index time, it
seems that Solr doesn't allow the leading wildcard search, it will return
the error:
org.apache.lucene.queryParser.ParseException: Cannot parse
'sequence:*A*': '*' or '?' not allowed as first character in
WildcardQuery
But when I use the ReversedWildcardFilterFactory, I can use the *A* in
the query. But as I know, the ReversedWildcardFilterFactory should work in
the index part, should not affect the query behavior. If it is true, how
does this happen?
2.Based on the question above
suppose I have those tokens in index.
1.AB/MNO/UUFI
2.BC/MNO/IUYT
3.D/MNO/QEWA
4./MNO/KGJGLI
5.QOEOEF/MNO/
suppose I use the lucene, I can set the QueryParser with
AllowLeadingWildcard(true), to search *MNO*
it should return the tokens above(1-5)
But in solr, when I conduct the *MNO* with the ReversedWildcardFilterFactory
in the index, but use the StandardAnalyzer in the query, I don't know what
happens here.
The leading *MNO should be fast to match the 5 with
ReversedWildcardFilterFactory
The tailer MNO* should be fast to match 4
But What about *MNO* ?
Thanks!
--
View this message in context:
http://lucene.472066.n3.nabble.com/Further-questions-about-behavior-in-ReversedWildcardFilterFactory-tp3905416p3905416.html
Sent from the Solr - User mailing list archive at Nabble.com.
