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https://issues.apache.org/jira/browse/SOLR-11164?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16130976#comment-16130976
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Christine Poerschke commented on SOLR-11164:
--------------------------------------------
Thanks [~yuyano] for the new patch against master branch!
(It will work of course but I have doubts re: hard-coding the special
interpretation of _0.0f_ meaning _"no score"_ in another place and therefore
have proposed SOLR-11254 _DocTransformer.transform_ signature change as a way
to avoid that.)
> OriginalScoreFeature causes NullPointerException during feature logging with
> SolrCloud mode.
> --------------------------------------------------------------------------------------------
>
> Key: SOLR-11164
> URL: https://issues.apache.org/jira/browse/SOLR-11164
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: contrib - LTR
> Affects Versions: 6.6
> Reporter: Yuki Yano
> Attachments: SOLR-11164_master.patch, SOLR-11164.patch,
> SOLR-11164.patch
>
>
> In FeatureTransfer, OriginalScoreFeature uses original Query instance
> preserved in LTRScoringQuery for the evaluation.
> This query is set in RankQuery#wrap during QueryComponent#process.
> With SolrCloud mode, document searches take two steps: finding top-N document
> ids, and filling documents of found ids.
> In this case, FeatureTransformer works in the second step and tries to
> extract features with LTRScoringQuery built in QueryComponent#prepare.
> However, because the second step doesn't call QueryComponent#process, the
> original query of LTRScoringQuery remains null and this causes
> NullPointerException while evaluating OriginalScoreFeature.
> We can get the original query from ResultContext which is an argument of
> DocTransformer#setContext, thus this problem can solve by using it if
> LTRScoringQuery doesn't have correct original query.
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