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https://issues.apache.org/jira/browse/SOLR-9312?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15381568#comment-15381568
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Erick Erickson commented on SOLR-9312:
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Please raise questions like this on the user's list first. They will get more
people seeing them. If, through discussion, we determine that it's a bona-fide
code issue, _then_ we can raise a JIRA.
In this case it's not clear at all that there is any error. For instance, if
every doc that mentions magnetic also mentions flux, the results would be what
you report. Solr does not implement strict boolean logic, see:
https://lucidworks.com/blog/2011/12/28/why-not-and-or-and-not/
That said, edismax has had some work done on it lately, have you checked
whether a recent 6.x version exhibits the same behavior?
> eDisMax operator "-" ignores parentheses
> ----------------------------------------
>
> Key: SOLR-9312
> URL: https://issues.apache.org/jira/browse/SOLR-9312
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Affects Versions: 5.5
> Environment: GNU/Linux 4.6.4-1-ARCH
> Reporter: Patryk Hes
>
> Solr eDisMax query parser seems to ignore parentheses when combined with "-"
> operator. For example, query:
> -(magnetic flux)
> gives exactly the same results as if querying:
> -magnetic flux
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