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https://issues.apache.org/jira/browse/SOLR-15595?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Eric Pugh resolved SOLR-15595.
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Resolution: Fixed
> Partial results from shard queries needlessly discarded for queries without
> sort fields
> ---------------------------------------------------------------------------------------
>
> Key: SOLR-15595
> URL: https://issues.apache.org/jira/browse/SOLR-15595
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Affects Versions: 8.1, 8.1.1, 8.2, 8.3, 8.3.1, 8.4, 8.4.1, 8.5, 8.5.1,
> 8.5.2, 8.6, 8.6.1, 8.6.2, 8.6.3, 8.7, 8.8, 8.9, 8.8.1, 8.8.2
> Reporter: Michael Kosten
> Assignee: David Eric Pugh
> Priority: Major
> Fix For: main (9.0), 8.10
>
> Time Spent: 3h 20m
> Remaining Estimate: 0h
>
> SOLR-9882 introduced a behavior change in handing partial results from a
> shard when a timeout occurs. If a shard returns partial results and an empty
> sortValues, then all the results for a shard are discarded. For a scoring
> query the sortValues is empty, so partial results results are never included
> in the merged results. If all shards timeout, then zero results are returned.
> Co-incidentally, in some timeout scenarios sortValues is null. This was
> recently addressed in SOLR-14758, but that code is impacted by the proposed
> change, which is to set sortValues to an empty list if is null and to no
> longer skip merging the shard results when sortValues is empty and the shard
> results are partial. There may be necessary changes further down in the merge
> phase when sortValues are missing, partial results are returned and the
> sortSpec expects sortValues.
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