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https://issues.apache.org/jira/browse/SOLR-5730?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13923920#comment-13923920
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Robert Muir commented on SOLR-5730:
-----------------------------------
Hello, some things that might simplify some of the TODOs, is we changed the
SortingMergePolicy API in LUCENE-5493 to just take Sort.
This means you can have multiple fields, they dont have to be numeric
docvalues, and so on. So I think this can simplify the configuration of this
thing too, e.g. you could just take a standard "sort spec string" and parse it
with QueryParsing.getSort or whatever (some refactoring might be needed here).
It would be good though, to check that Sort.needsScores() == false, as that
makes no sense at index-time... I'll open an issue to add this check to
SortingMergePolicy itself in lucene.
The other difference is, EarlyTerminatingSortingCollector now also takes a
Sort, except really you should just pass the Sort being used for the Query (it
does the proper checking against the segments to see if the segment was sorted
in a compatible way, and if so, will optimize with early termination). Today
this just checks that they are exactly equal, but in the future it can be
smarter (LUCENE-5499).
Hopefully this makes the integration easier.
> make Lucene's SortingMergePolicy and EarlyTerminatingSortingCollector
> configurable in Solr
> ------------------------------------------------------------------------------------------
>
> Key: SOLR-5730
> URL: https://issues.apache.org/jira/browse/SOLR-5730
> Project: Solr
> Issue Type: New Feature
> Reporter: Christine Poerschke
> Priority: Minor
>
> Example configuration:
> solrconfig.xml
> {noformat}
> <mergeSorter class="org.apache.solr.update.DefaultMergeSorterFactory"/>
> {noformat}
> schema.xml
> {noformat}
> <mergeSorterKey class="org.apache.solr.schema.SingleFieldSorterFactory">
> <str name="fieldName">timestamp</str>
> <bool name="ascending">false</bool>
> </mergeSorterKey>
> {noformat}
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