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https://issues.apache.org/jira/browse/LUCENE-6590?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15324676#comment-15324676
]
Upayavira commented on LUCENE-6590:
-----------------------------------
Here's an example for 4.10 and the same query against 5.5 - note, it is a
different doc though:
{code}
4.10 score ========================================================
"2937439": {
"match": true,
"value": 5.5993805,
"description": "weight(description:obama in 394012)
[DefaultSimilarity], result of:",
"details": [
{
"match": true,
"value": 5.5993805,
"description": "fieldWeight in 394012, product of:",
"details": [
{
"match": true,
"value": 1,
"description": "tf(freq=1.0), with freq of:",
"details": [
{
"match": true,
"value": 1,
"description": "termFreq=1.0"
}
]
},
{
"match": true,
"value": 5.5993805,
"description": "idf(docFreq=56010, maxDocs=5568765)"
},
{
"match": true,
"value": 1,
"description": "fieldNorm(doc=394012)"
}
]
}
]
5.5 score ========================================================
"2502281":{
"match":true,
"value":28.51136,
"description":"weight(description:obama in 43472) [], result
of:",
"details":[{
"match":true,
"value":28.51136,
"description":"score(doc=43472,freq=1.0), product of:",
"details":[{
"match":true,
"value":5.339603,
"description":"queryWeight, product of:",
"details":[{
"match":true,
"value":5.339603,
"description":"idf(docFreq=31905,
maxDocs=2446459)"},
{
"match":true,
"value":1.0,
"description":"queryNorm"}]},
{
"match":true,
"value":5.339603,
"description":"fieldWeight in 43472, product of:",
"details":[{
"match":true,
"value":1.0,
"description":"tf(freq=1.0), with freq of:",
"details":[{
"match":true,
"value":1.0,
"description":"termFreq=1.0"}]},
{
"match":true,
"value":5.339603,
"description":"idf(docFreq=31905,
maxDocs=2446459)"},
{
"match":true,
"value":1.0,
"description":"fieldNorm(doc=43472)"}]}]}]},
{code}
> Explore different ways to apply boosts
> --------------------------------------
>
> Key: LUCENE-6590
> URL: https://issues.apache.org/jira/browse/LUCENE-6590
> Project: Lucene - Core
> Issue Type: Wish
> Reporter: Adrien Grand
> Priority: Minor
> Fix For: 5.4
>
> Attachments: LUCENE-6590.patch, LUCENE-6590.patch, LUCENE-6590.patch,
> LUCENE-6590.patch, LUCENE-6590.patch, LUCENE-6590.patch, LUCENE-6590.patch
>
>
> Follow-up from LUCENE-6570: the fact that all queries are mutable in order to
> allow for applying a boost raises issues since it makes queries bad cache
> keys since their hashcode can change anytime. We could just document that
> queries should never be modified after they have gone through IndexSearcher
> but it would be even better if the API made queries impossible to mutate at
> all.
> I think there are two main options:
> - either replace "void setBoost(boost)" with something like "Query
> withBoost(boost)" which would return a clone that has a different boost
> - or move boost handling outside of Query, for instance we could have a
> (immutable) query impl that would be dedicated to applying boosts, that
> queries that need to change boosts at rewrite time (such as BooleanQuery)
> would use as a wrapper.
> The latter idea is from Robert and I like it a lot given how often I either
> introduced or found a bug which was due to the boost parameter being ignored.
> Maybe there are other options, but I think this is worth exploring.
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