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Posted to solr-user@lucene.apache.org by Wei <we...@gmail.com> on 2019/07/11 22:03:19 UTC

Function Query with multi-value field

Hi,

I have a question regarding function query that operates on multi-value
fields.  For the following field:

<field name=rgbcolor type="string" indexed="true" stored="true"
multivalued="true"/>

 Each value is a hex string representation of RGB value.  for example there
are 3 values indexed

#FF00FF    - C1
#EE82EE   - C2
#DA70D6   - C3

How would I write a function query that operates on all values of the
field?  Given color S in query, how to calculate the similarities between S
and C1/C2/C3 and find which one is the closest?
I checked https://lucene.apache.org/solr/guide/6_6/function-queries.html but
didn't see an example.

Thanks,
Wei

Re: Function Query with multi-value field

Posted by Emir Arnautović <em...@sematext.com>.

Hi Wei,
I see two options:
1. create custom distance function for colors
2. split each color component to a separate numeric fields and try calculate distance function using standard set of functions. (I think that Solr does not support 3d points).

HTH,
Emir
--
Monitoring - Log Management - Alerting - Anomaly Detection
Solr & Elasticsearch Consulting Support Training - http://sematext.com/



> On 14 Jul 2019, at 00:47, Wei <we...@gmail.com> wrote:
> 
> Any suggestion?
> 
> On Thu, Jul 11, 2019 at 3:03 PM Wei <we...@gmail.com> wrote:
> 
>> Hi,
>> 
>> I have a question regarding function query that operates on multi-value
>> fields.  For the following field:
>> 
>> <field name=rgbcolor type="string" indexed="true" stored="true"
>> multivalued="true"/>
>> 
>> Each value is a hex string representation of RGB value.  for example
>> there are 3 values indexed
>> 
>> #FF00FF    - C1
>> #EE82EE   - C2
>> #DA70D6   - C3
>> 
>> How would I write a function query that operates on all values of the
>> field?  Given color S in query, how to calculate the similarities between
>> S and C1/C2/C3 and find which one is the closest?
>> I checked https://lucene.apache.org/solr/guide/6_6/function-queries.html but
>> didn't see an example.
>> 
>> Thanks,
>> Wei
>>

Re: Function Query with multi-value field

Posted by Wei <we...@gmail.com>.

Any suggestion?

On Thu, Jul 11, 2019 at 3:03 PM Wei <we...@gmail.com> wrote:

> Hi,
>
> I have a question regarding function query that operates on multi-value
> fields.  For the following field:
>
> <field name=rgbcolor type="string" indexed="true" stored="true"
> multivalued="true"/>
>
>  Each value is a hex string representation of RGB value.  for example
> there are 3 values indexed
>
> #FF00FF    - C1
> #EE82EE   - C2
> #DA70D6   - C3
>
> How would I write a function query that operates on all values of the
> field?  Given color S in query, how to calculate the similarities between
> S and C1/C2/C3 and find which one is the closest?
> I checked https://lucene.apache.org/solr/guide/6_6/function-queries.html but
> didn't see an example.
>
> Thanks,
> Wei
>