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https://issues.apache.org/jira/browse/SOLR-8441?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Julien MASSENET updated SOLR-8441:
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Attachment: lucene_solr_5_3-GroupingMaxScore.patch
> maxScore is sometimes missing from distributed grouped responses
> ----------------------------------------------------------------
>
> Key: SOLR-8441
> URL: https://issues.apache.org/jira/browse/SOLR-8441
> Project: Solr
> Issue Type: Bug
> Components: search
> Affects Versions: 5.3
> Reporter: Julien MASSENET
> Priority: Minor
> Attachments: lucene_solr_5_3-GroupingMaxScore.patch
>
>
> This issue occurs when using the grouping feature in distributed mode and
> sorting by score.
> Each group's {{docList}} in the response is supposed to contain a
> {{maxScore}} entry that hold the maximum score for that group. Using the
> current releases, it sometimes happens that this piece of information is not
> included:
> {code}
> {
> "responseHeader": {
> "status": 0,
> "QTime": 42,
> "params": {
> "sort": "score desc",
> "fl": "id,score",
> "q": "_text_:\"72\"",
> "group.limit": "2",
> "group.field": "group2",
> "group.sort": "score desc",
> "group": "true",
> "wt": "json",
> "fq": "group2:72 OR group2:45"
> }
> },
> "grouped": {
> "group2": {
> "matches": 567,
> "groups": [
> {
> "groupValue": 72,
> "doclist": {
> "numFound": 562,
> "start": 0,
> "maxScore": 2.0378063,
> "docs": [
> {
> "id": "29!26551",
> "score": 2.0378063
> },
> {
> "id": "78!11462",
> "score": 2.0298104
> }
> ]
> }
> },
> {
> "groupValue": 45,
> "doclist": {
> "numFound": 5,
> "start": 0,
> "docs": [
> {
> "id": "72!8569",
> "score": 1.8988966
> },
> {
> "id": "72!14075",
> "score": 1.5191172
> }
> ]
> }
> }
> ]
> }
> }
> }
> {code}
> Looking into the issue, it comes from the fact that if a shard does not
> contain a document from that group, trying to merge its {{maxScore}} with
> real {{maxScore}} entries from other shards is invalid (it results in NaN).
> I'm attaching a patch containing a fix.
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