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Date: Sat, 12 Mar 2011 01:21:30 -0500
Message-ID: <AANLkTimrMJ3NJYhoNCLJGgEi_C_tOsDC00UP+D7TuVBb@mail.gmail.com>
Subject: Re: custom ValueSource for decoding geohash into lat & lon
From: Ryan McKinley <ryantxu@gmail.com>
To: dev@lucene.apache.org
Cc: "Smiley, David W." <dsmiley@mitre.org>
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Rather then use the FieldCache, you may consider a
WeakHashMap<IndexReader,YourObject>  solr uses this and the internals
of FieldCache are implemented like this.  Long term, I want to see the
FieldCache moved to a map directly on the IndexReader (LUCENE-2665 but
that has a ways to go)


On Fri, Mar 11, 2011 at 5:25 PM, Smiley, David W. <dsmiley@mitre.org> wrote=
:
> On Mar 10, 2011, at 6:21 PM, William Bell wrote:
>
>> 1. ValueSources does not support MultiValue fields.
>
> I think the problem isn't ValueSources, it's the FieldCache. =A0The Field=
Cache is fundamentally very limited to one indexed primitive value per docu=
ment. I took a look at UninvertedField but that appears to be tied to facet=
ing and it's not sufficiently flexible any way. I think I need to do, as Un=
invertedField does, create a cache registered in solrconfig.xml. =A0The oth=
er tricky bit is somehow accessing it. =A0I think I figured it out. In my f=
ield type's getValueSource(SchemaField field, QParser parser), the parser i=
s a FunctionQParser implementation, which has access to SolrQueryRequest, w=
hich has access to SolrIndexSearcher, which allows me to lookup the cache b=
y the name I choose. =A0That's quite a chain of indirection that took time =
to track down; I nearly gave up :-).
>
> ~ David
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