[SOLR-13143] Output from ExplainAugmenterFactory and DebugQuery for rerank queries is not same

• Type: Bug
• Status: Patch Available
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: 7.5
• Component/s: search
• Assignee: Unassigned
• Reporter: Sambhav Kothari
• Created: 17/Jan/19 12:41
• Updated: 10/Jun/19 02:03

Description

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)

Mailing List - 

 

http://mail-archives.apache.org/mod_mbox/lucene-solr-user/201901.mbox/%3C5C3879D702C30144003902B0_0_18802%40msllnjpmsgsv06%3E

Issue Links

• is related to: SOLR-13126 Multiplicative boost of isn't applied when one of the summed or multiplied queries doesn't match
• links to: GitHub Pull Request #539