[
https://issues.apache.org/jira/browse/SOLR-12323?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Alexandre Rafalovitch closed SOLR-12323.
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> Missing explain information
> ---------------------------
>
> Key: SOLR-12323
> URL: https://issues.apache.org/jira/browse/SOLR-12323
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Affects Versions: 7.3
> Reporter: Stefan Langenmaier
> Priority: Major
>
> We have a problem in Solr 7.3 with the explain field when the edismax query
> parser is used with the boost parameter.
> To reproduce the issue I created a collection "mycollection" with the default
> configset and indexed the following csv data:
> {code:java}
> title_txt,rating_i
> mytext,2
> {code}
> When I issue the following query to analyse the computation of the score
> [http://localhost:8983/solr/mycollection/select?boost=rating_i&defType=edismax&fl=*,score,[explain]&q=title_txt:mytext]
>
> I receive the following response:
> {code:java}
> {
> "responseHeader":{
> "status":0,
> "QTime":3,
> "params":{
> "q":"title_txt:mytext",
> "defType":"edismax",
> "fl":"*,score,[explain]",
> "boost":"rating_i"}},
> "response":{"numFound":1,"start":0,"maxScore":0.5753642,"docs":[
> {
> "title_txt":["mytext"],
> "rating_i":2,
> "id":"3a7299dc-9628-403b-935b-0ddf17e74897",
> "_version_":1599803310411350016,
> "score":0.5753642,
> "[explain]":"0.5753642 = product of:\n 1.0 = boost\n 0.5753642 =
> boost(int(rating_i))\n"}]
> }}
> {code}
> The explain no longer contains all the information of the score. For
> comparison with Solr 7.2.1 but otherwise the same setup the output looks like
> this:
> {code:java}
> {
> "responseHeader":{
> "status":0,
> "QTime":3,
> "params":{
> "q":"title_txt:mytext",
> "defType":"edismax",
> "fl":"*,score,[explain]",
> "boost":"rating_i"}},
> "response":{"numFound":1,"start":0,"maxScore":0.5753642,"docs":[
> {
> "title_txt":["mytext"],
> "rating_i":2,
> "id":"747b9102-0566-4786-a155-87fac10388cc",
> "_version_":1599803926880714752,
> "score":0.5753642,
> "[explain]":"0.5753642 = boost(title_txt:mytext,int(rating_i)),
> product of:\n 0.2876821 = weight(title_txt:mytext in 0) [SchemaSimilarity],
> result of:\n 0.2876821 = score(doc=0,freq=1.0 = termFreq=1.0\n), product
> of:\n 0.2876821 = idf, computed as log(1 + (docCount - docFreq + 0.5) /
> (docFreq + 0.5)) from:\n 1.0 = docFreq\n 1.0 = docCount\n
> 1.0 = tfNorm, computed as (freq * (k1 + 1)) / (freq + k1 * (1 - b + b *
> fieldLength / avgFieldLength)) from:\n 1.0 = termFreq=1.0\n 1.2
> = parameter k1\n 0.75 = parameter b\n 1.0 = avgFieldLength\n
> 1.0 = fieldLength\n 2.0 = int(rating_i)=2\n"}]
> }}
> {code}
> When the boost parameter gets remove Solr 7.3 also show the calculation again:
> {code:java}
> {
> "responseHeader":{
> "status":0,
> "QTime":1,
> "params":{
> "q":"title_txt:mytext",
> "defType":"edismax",
> "fl":"*,score,[explain]"}},
> "response":{"numFound":1,"start":0,"maxScore":0.2876821,"docs":[
> {
> "title_txt":["mytext"],
> "rating_i":2,
> "id":"3a7299dc-9628-403b-935b-0ddf17e74897",
> "_version_":1599803310411350016,
> "score":0.2876821,
> "[explain]":"0.2876821 = weight(title_txt:mytext in 0)
> [SchemaSimilarity], result of:\n 0.2876821 = score(doc=0,freq=1.0 =
> termFreq=1.0\n), product of:\n 0.2876821 = idf, computed as log(1 +
> (docCount - docFreq + 0.5) / (docFreq + 0.5)) from:\n 1.0 = docFreq\n
> 1.0 = docCount\n 1.0 = tfNorm, computed as (freq * (k1 + 1)) / (freq +
> k1 * (1 - b + b * fieldLength / avgFieldLength)) from:\n 1.0 =
> termFreq=1.0\n 1.2 = parameter k1\n 0.75 = parameter b\n 1.0 =
> avgFieldLength\n 1.0 = fieldLength\n"}]
> }}
> {code}
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