On Feb 2, 2007, at 1:02 PM, Ng Vinny wrote:
After processing some text, I have constructed a Boolean query , e.g.
"title:Lucene author:Otis", and I would like to store the query to
reuse
when the same piece of text is issued (to avoid re-processing of
the same
text).
Solr (can't help but point to it) does query result DocSet/List
caching, which dramatically speeds up requests for the same query or
successive pages of the same query [couple that with the filter query
and facet query capability... wow!]. You could cache (bits of) the
results of a query and key it by the query expression. This
obviously has merit, but whether you need to go that far for your
needs or not depend on the scale.
I thought of storing the string resulted from Query.toString()
method, but
there is no constructor of Query to build a new Query from the
string I
retrieve from the datastore.
The Query.toString() output is QueryParser-like. Generally speaking
you can .toString() a query and QueryParser it and you'll have the
same query. But, this may not always be the case. A rewritten Query
can be different, and also I wouldn't bank on the fact that all the
Query subclasses have kept QueryParser roundtripping compliance.
Maybe, but I'd be surprised if there weren't some exceptions.
Erik
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