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https://issues.apache.org/jira/browse/SOLR-2996?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13177799#comment-13177799
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Hoss Man commented on SOLR-2996:
--------------------------------
Recent example of this type of confusion and the problems it can cause from the
mailing list...
https://mail-archives.apache.org/mod_mbox/lucene-solr-user/201112.mbox/%3Calpine.DEB.2.00.1112131115550.16571@bester%3E
Another recent discussion about this type of problem from IRC...
{noformat}
13:25 < mikeliss:#solr> Hi, I'm running into an error with maxbooleanclauses
when I try to do a range query with
highlighting...is there any workaround for this? Would
really appreciate some direction, if
anybody knows.
13:26 < mikeliss:#solr> This is the query that dies:
http://localhost:8983/solr/select/?q=*&version=2.2&start=0&rows=20&indent=on&hl=true&hl.fl=text,caseName,westCite,docketNumber,lexisCite,court_citation_string&hl.snippets=5&f.text.hl.alternateField=text&f.text.hl.maxAlternateFieldLength=500
13:28 < hoss:#solr> that query doesn't make sense ... for a couple of reasons
... what are you *trying* to do?
13:29 < hoss:#solr> i mena ... for starters ... there is no range query there.
second, q=* is a big red flag: it's
a prefix query on the default field using the prefix ""
(ie: the empty string)
14:23 < mikeliss:#solr> hoss, yeah, I assumed that highlighting would just do
nothing if a prefix query were given
on an empty string.
14:24 < mikeliss:#solr> hoss, I added a check in my code that will only enable
highlighting if the query isn't '*'.
14:24 < mikeliss:#solr> hoss, Seems naive, but it's working at least for the
moment.
14:27 < hoss:#solr> i think you're missing my point: q=* is a fairly
non-sensical query ... you should't just
prevent highlighting on that query, you should stop doing
that query in the first place
14:28 < hoss:#solr> as a query solr can handle it, and optimize it to be
efficient
14:28 < hoss:#solr> (evenn though it's silly)
14:28 < mikeliss:#solr> hoss, I'm using that query on my homepage to show the
latest documents in the index. It
should just return everything, right?
14:28 < hoss:#solr> but for highlighting, the highlighter actually needs to
know all the terms it matches
14:28 < hoss:#solr> and to konw al lthe terms it matches, it needs to look at
*ALL* the terms in the default field
14:29 < hoss:#solr> mikeliss: no, no, NO ... i'm not sure where people started
getting the missconception that
"q=*" matches all docs, but that is *NOT* what it does
14:29 < hoss:#solr> one second...
14:30 < hoss:#solr> mikeliss:
https://mail-archives.apache.org/mod_mbox/lucene-solr-user/201112.mbox/%3CCAL69qOn1XeMNz6JYdWj_o7rH_=o3i-niqdo6rorvn48bywu...@mail.gmail.com%3E
14:30 < hoss:#solr> ...and...
14:30 < hoss:#solr>
https://mail-archives.apache.org/mod_mbox/lucene-solr-user/201112.mbox/%3Calpine.DEB.2.00.1112131115550.16571@bester%3E
14:32 < mikeliss:#solr> hoss, ah, that makes sense. I guess * is just too
tempting, since it is something users can
easily remember.
14:34 < mikeliss:#solr> hoss, back to my original issue, now I'm confused why
hl fails on a search for *. Shouldn't
it just highlight nothing, and return results? I wasn't
able to get debugging to work for
the query, so I'm a bit confused..
14:35 < hoss:#solr> see my other comment above: the highlighter is trying to
find all the terms used in the query
to highlight them -- a query for "*" matches all terms in
the default field, which is way more
then the highlighter can handle (hence the exception)
14:38 < hoss:#solr> i'm filing a bug to change the beahvior of "q=*" ... do you
mind if i cut/paste this dialog
into the jira issue as an example of user confusion?
14:39 < mikeliss:#solr> Not at all. I was wondering if that was potentially a
bug...figured I'd leave it to the
experts.
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> make "q=*" not suck in the lucene and edismax parsers
> -----------------------------------------------------
>
> Key: SOLR-2996
> URL: https://issues.apache.org/jira/browse/SOLR-2996
> Project: Solr
> Issue Type: Improvement
> Reporter: Hoss Man
>
> More then a few users have gotten burned by thinking that "*" is the
> appropriate syntax for "match all docs" when what it really does (unless i'm
> mistaken) is create a prefix query on the default search field using a blank
> string as the prefix.
> since it seems very unlikely that anyone has a genuine usecase for making a
> prefix query with a blank prefix, we should change the default behavior of
> the LuceneQParser and EDismaxQParsers (and any other Qparsers that respect
> *:* if i'm forgetting them) to treat this situation the same as *:*. we can
> offer a (local)param to force the old behavior if someone really wants it.
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