[
https://issues.apache.org/jira/browse/SOLR-7878?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14692461#comment-14692461
]
Hoss Man commented on SOLR-7878:
--------------------------------
bq. ...and today multi-valued sorting isn't directly possible.
Can you explain what you mean by that?
With SOLR-2522 + LUCENE-6609 you can do things like:
{{sort=field(multi_valued_numeric_field,min)+asc}} and it directly uses
SortedSetSortField under the covers. (although it's admittedly very new so you
may have just overlooked that it was recently added ... like a day before you
opened this jira :) )
NOTE: i agree, it would be nice to figure out a way to move towards
SortedNumericDocValues, and/or maybe even Mike's cool work in LUCENE-6697, i
just want to clarify whether this would purely be about optimizing current
performance and minimizing code complexity, or if there is some actual
functionality of SortedNumericDocValues that you know we are currently missing
out on that i'm not aware of.
> Use SortedNumericDocValues (efficient sort & facet on multi-valued numeric
> fields)
> ----------------------------------------------------------------------------------
>
> Key: SOLR-7878
> URL: https://issues.apache.org/jira/browse/SOLR-7878
> Project: Solr
> Issue Type: Improvement
> Components: Facet Module
> Reporter: David Smiley
>
> Lucene has a SortedNumericDocValues (i.e. multi-valued numeric DocValues),
> ever since late in the 4x versions. Solr's TrieField.createFields
> unfortunately still uses SortedSetDocValues for the multi-valued case.
> SortedNumericDocValues is more efficient than SortedSetDocValues; for example
> there is no 'ordinal' mapping for sorting/faceting needed.
> Unfortunately, updating Solr here would be quite a bit of work, since there
> are backwards-compatibility concerns, and faceting code would need a new code
> path implementation just for this. Sorting is relatively simple thanks to
> SortedNumericSortField, and today multi-valued sorting isn't directly
> possible.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
