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https://issues.apache.org/jira/browse/LUCENE-5417?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13894303#comment-13894303
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Peng Cheng commented on LUCENE-5417:
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Hi, May I ask for some help on test case implementation? I have finished
writing extensions of MultiValueSources that has the described functionality:
they can read multiple ByteRef from the FieldCache by using getDocTermOrds(),
and then cast them into different data types (String, float etc.) through
parsers. While I got not problem making them running in a new project, I don't
know how to test it in solr test framework. (Apparently it uses JUnit but
override many default settings) Namely, I got sporadic 'fix your classpath to
have tests-framework.jar before lucene-core.jar' exception, and when I don't
get that exception, I got 'Insane FieldCache usage(s)', I have googled them but
all resolutions points to 3.x version (btw using '@SuppressCodecs("Lucene3x")'
only reduces the frequency of the first problem). May I ask an expert to have a
look at my test cases?
One more thing: the added ValueSource(s) needs a dimensionality parameter to
construct, this is because the current FunctionValues interface does not
support reading of variable-length array from a field. To make the solution
easier to use, we may need a more powerful FunctionValues that can return
dimensionality when ***Val(int doc) method is called.
> Solr function query supports reading multiple values from a field.
> ------------------------------------------------------------------
>
> Key: LUCENE-5417
> URL: https://issues.apache.org/jira/browse/LUCENE-5417
> Project: Lucene - Core
> Issue Type: New Feature
> Components: core/query/scoring
> Affects Versions: 4.6
> Environment: N/A
> Reporter: Peng Cheng
> Priority: Minor
> Fix For: 4.7
>
> Original Estimate: 168h
> Remaining Estimate: 168h
>
> Solr function query is a powerful tool to customize search criterion and
> ranking function (http://wiki.apache.org/solr/FunctionQuery). However, it
> cannot effectively benefit from field values from multi-valued field, namely,
> the field(...) function can only read one value and discard the others.
> This limitation has been associated with FieldCacheSource, and the fact that
> FieldCache cannot fetch multiple values from a field, but such constraint has
> been largely lifted by LUCENE-3354, which allows multiple values to be
> extracted from one field. Those values in turn can be used as parameters of
> other functions to yield a single score.
> I personally find this limitation very unhandy when building a
> learning-to-rank system that uses many cues and string features. Therefore I
> would like to post this feature request and (hopefully) work on it myself.
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