Sambhav Kothari created SOLR-13143:
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Summary: Output from ExplainAugmenterFactory and DebugQuery for
rerank queries is not same
Key: SOLR-13143
URL: https://issues.apache.org/jira/browse/SOLR-13143
Project: Solr
Issue Type: Bug
Security Level: Public (Default Security Level. Issues are Public)
Components: search
Affects Versions: 7.5
Reporter: Sambhav Kothari
Attachments: bug.patch
Currently, if we use the ExplainAugmenterFactory with LtR, instead of using the
model/re-rankers explain method, it uses the default query explain (tf-idf
explanation). This happens because the BasicResultContext doesn't wrap the
query(https://github.com/apache/lucene-solr/blob/1d85cd783863f75cea133fb9c452302
214165a4d/solr/core/src/java/org/apache/solr/response/BasicResultContext.java#L6
7) with the RankQuery when its set to context's query, which is then used by
the ExplainAugmenterFactory.
(https://github.com/apache/lucene-solr/blob/1d85cd783863f75cea133fb9c45230221416
5a4d/solr/core/src/java/org/apache/solr/response/transform/ExplainAugmenterFacto
ry.java#L111).
As a result there are discrepancies between queries like -
http://localhost:8983/solr/collection1/select?q=*:*&collection=collectionName&wt
=json&fl=[explain style=nl],score&rq=\{!ltr model=linear-model}
http://localhost:8983/solr/collection1/select?q=*:*&collection=collectionName&wt
=json&fl=score&rq=\{!ltr model=linear-model}&debugQuery=true
the former outputs the explain from the SimilarityScorer's explain while the
latter uses the correct LtR ModelScorer's explain.
There are a few other problems with the explain augmenter - for eg. it doesn't
work with grouping (although the other doc transformers like LtR's
LTRFeatureLoggerTransformerFactory work with grouping)
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