The only way is using a frange (function range) query:
q={!frange l=0 u=10}my_external_field
Will pull out documents that have your external field with a value
between zero and 10.
Upayavira
On Wed, Jun 26, 2013, at 09:02 PM, Arun Rangarajan wrote:
> http://docs.lucidworks.com/display/solr/Working+with+External+Files+and+Processes
> says
> this about external file fields:
> "They can be used only for function queries or display".
> I understand how to use them in function queries, but how do I retrieve
> the
> values for display?
>
> If I want to fetch only the values of a single external file field for a
> set of primary keys, I can do:
> q=_val_:"EXT_FILE_FIELD"&fq=id:(doc1 doc2 doc3)&fl=id,score
> For this query, the score is the value of the external file field.
>
> But how to get the values for docs that match some arbitrary query? Is
> there a syntax trick that will work where the value of the ext file field
> does not affect the score of the main query, but I can still retrieve its
> value?
>
> Also is it possible to retrieve the values of more than one external file
> field in a single query?
