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From Mike Sokolov <msoko...@gmail.com>
Subject Re: FunctionValues vs DoubleValuesSource
Date Fri, 13 Oct 2017 14:55:39 GMT
Oh thanks Alan that's a good suggestion, but I already wrote max and sum double values sources
since it was easy enough. If you think that's a good approach I could post a patch.

On October 13, 2017 3:57:30 AM EDT, Alan Woodward <alan@flax.co.uk> wrote:
>Hi,
>
>Yes, moving stuff over to DoubleValuesSource is only half done at the
>moment, unfortunately!
>
>Can you use the expressions module to do what you want?  The
>SimpleBindings class allows you to map arbitrary DoubleValuesSource
>objects to specific names, and then you can combine them using
>javascript functions.
>
>Alan Woodward
>www.flax.co.uk
>
>
>> On 12 Oct 2017, at 23:25, Michael McCandless
><lucene@mikemccandless.com> wrote:
>> 
>> Hi Mike,
>> 
>> It looks like FunctionValues is a very old API used by many function
>> queries, while DoubleValuesSource is relatively new (introduced in
>> https://issues.apache.org/jira/browse/LUCENE-5325).
>> 
>> This comment (
>>
>https://issues.apache.org/jira/browse/LUCENE-5325?focusedCommentId=15235324&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15235324)
>> on the issue seems to refer to wrapper classes to convert between the
>old
>> and new APIs?
>> 
>> I admit the situation is rather confusing; but we've been gradually
>working
>> on cutting over modules to the new API.  Patches welcome!
>> 
>> Mike McCandless
>> 
>> http://blog.mikemccandless.com
>> 
>> On Tue, Oct 10, 2017 at 3:39 PM, Sokolov, Michael
><msokolov@gmail.com>
>> wrote:
>> 
>>> Hi, I'm trying to implement a complex set of values computed
>according to
>>> some externally-driven specification, so I am looking at these APIs.
>My
>>> question is whether there is any way to mix them. I have implemented
>some
>>> DoubleValuesSources and now I want combine them using sum, max, etc.
>I
>>> noticed these handy classes over in
>o.a.l.queries.function.valuesource,
>>> but they seem to be of a different flavor than the DVS API is
>designed for.
>>> EG DVS is kind of an iterative API while the functions appear to be
>random
>>> access (you pass them a docid). I could code up my own DVS for
>functions
>>> like max, sum and so on, but I wonder if there is some kind of
>adapter, or
>>> at least a reasonable strategy that would let one mix these apis?
>>> 
>>> -Mike
>>> 
>>> 
>>>
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