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https://issues.apache.org/jira/browse/SOLR-2522?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hoss Man updated SOLR-2522:
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Attachment: SOLR-2522.patch
I don't think this was possible back when the issue was first filed because of
how the ValueSource API was tied so closely with the FieldCache API.
But with DocValues API, this is in fact now possible -- but only for fields
that actually use DocValues. The UninvertedReader's implementation of
SortedSetDocValues doesn't support RandomAccessOrds so we can't support those
(yet - i'll file a related issue to see if it's possible to improve that later)
The attached patch has a starting point for an implementation of this for all
of the TrieFields and some basic tests (but i want to add some more randomized
tests as well, in addition to tests of some of the error cases.)
The main thing that's missing from this patch is the syntax -- getting
"min(multivalued_field_name)" to work is non trivial, so for now i just hacked
in a "minf(fieldname)" and "maxf(fieldname)" function to get something i could
write tests against -- working on the ValueSourceParser changes to get the
syntax we all want to work is the next big thing on the agenda.
The other thing i want to look into is LUCENE-6609 -- the same comments there
about directly using the SortField for the underlying field should also
correlate here: changing SortedSetFieldSource.getSortField() to return an
instance of SortedSetSortField.
> Change max() and min() to work on multiValued fields
> -----------------------------------------------------
>
> Key: SOLR-2522
> URL: https://issues.apache.org/jira/browse/SOLR-2522
> Project: Solr
> Issue Type: Improvement
> Reporter: Bill Bell
> Attachments: SOLR-2522.patch
>
>
> Switch max() and min() functions to work on multiValued fields so we can
> do sort=min(fieldname) asc and the sort would work on multiValued fields...
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