Yuki Yano created SOLR-11164:
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Summary: 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
Environment: 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.
Reporter: Yuki Yano
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