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https://issues.apache.org/jira/browse/SOLR-8812?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15223581#comment-15223581
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Greg Pendlebury commented on SOLR-8812:
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[~erickerickson], personally, I am ambivalent with regards to timing and
versions. I am still not convinced there is actually an issue here, but I don't
want to be a dick and dismiss it out-of-hand.
The patches provided are simply about choosing default parameter values that
disrupt the least number of users who did not have mm set to an appropriate
value. Any user (risky, broad generalisation incoming) who puts a boolean OR
operator into an edismax query string would not want mm=100%, but that is what
is happening here.
> ExtendedDismaxQParser (edismax) ignores Boolean OR when q.op=AND
> ----------------------------------------------------------------
>
> Key: SOLR-8812
> URL: https://issues.apache.org/jira/browse/SOLR-8812
> Project: Solr
> Issue Type: Bug
> Components: query parsers
> Affects Versions: 5.5
> Reporter: Ryan Steinberg
> Assignee: Erick Erickson
> Priority: Blocker
> Fix For: 6.0, 5.5.1
>
> Attachments: SOLR-8812-barbie.patch, SOLR-8812.patch, SOLR-8812.patch
>
>
> The edismax parser ignores Boolean OR in queries when q.op=AND. This behavior
> is new to Solr 5.5.0 and an unexpected major change.
> Example:
> "q": "id:12345 OR zzzzzzzzzz",
> "defType": "edismax",
> "q.op": "AND",
> where "12345" is a known document ID and "zzzzzzzzzz" is a string NOT present
> in my data
> Version 5.5.0 produces zero results:
> "rawquerystring": "id:12345 OR zzzzzzzzzz",
> "querystring": "id:12345 OR zzzzzzzzzz",
> "parsedquery": "(+((id:12345
> DisjunctionMaxQuery((text:zzzzzzzzzz)))~2))/no_coord",
> "parsedquery_toString": "+((id:12345 (text:zzzzzzzzzz))~2)",
> "explain": {},
> "QParser": "ExtendedDismaxQParser"
> Version 5.4.0 produces one result as expected
> "rawquerystring": "id:12345 OR zzzzzzzzzz",
> "querystring": "id:12345 OR zzzzzzzzzz",
> "parsedquery": "(+(id:12345
> DisjunctionMaxQuery((text:zzzzzzzzzz))))/no_coord",
> "parsedquery_toString": "+(id:12345 (text:zzzzzzzzzz))"
> "explain": {},
> "QParser": "ExtendedDismaxQParser"
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