I am implementing a custom Solr FieldType for Solr trunk. One method I
override is:
Query getFieldQuery(QParser parser, SchemaField field, String externalVal)
My Query implementation can be vastly more efficient if the scores aren't
needed vs. when they are needed. My code constructing this is basically:
Filter f = makeFilter(...);//efficient
ValueSource vs = makeValueSource(...);//potentially not needed and uses
memory
return new FilteredQuery( new FunctionQuery(vs), f );
I would love to know when it is okay to return a ConstantScoreQuery wrapping my
Filter so that I needn't bother with my ValueSource. In my opinion, FieldType
should have a getFieldFilter() method similar to getFieldQuery(). Perhaps a
hint of some kind could be added to the QParser handed in -- a boolean flag or
some special local-param to indicate the constant score to use. Solr could
perform this when the QParser is constructed for a Filter Query.
Thoughts? Am I missing something?
~ David
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