So I'm trying to wrap my head around nested querries. Also that thing
that isn't a nested query, but is similar, which I think is called
"LocalParams syntax", like:
&q={!dismax qf=$something}cat dog
(All my examples are not URL-encoded for clarity, of course they'd have
to be before sending to solr).
I've been referring to both:
http://wiki.apache.org/solr/SolrQuerySyntax
http://www.lucidimagination.com/blog/2009/03/31/nested-queries-in-solr/
Let's start with that not-nested query example. Can you in fact use it
as above, to force dismax handling of the 'q' even if the qt or request
handler default is something else? The documentation is confusing: "In
standard Solr search handlers, the default type of the main query only
may be specified via the defType parameter. The default type of all
other query parameters will remain "lucene
<http://wiki.apache.org/solr/SolrQuerySyntax#lucene>"."
I _think_ it's trying to say that I _can_, even in a standard search
handler, force dismax with {!dismax}, I just can't change the type of
_other_ query parameters -- rather than saying that I _can't_ use
{!dismax} to force dismax type of 'q' in a "standard search handler". Yes?
Next, when we get to dismax---can I embed parameter value literals in
there, and how?
q={!dismax qf="field^2 field2^4"} some query
With quotes like that? What if a parameter value literal itself has a
quote mark in it, is there a way to escape it? (Say, can I embed an fq
in there whose value itself needs quotes?)
Will parameters supplied in LocalParams like that always "override"
something supplied in a straight query parameter?
&qf=somefield&q={!dismax qf=otherfield} cat dog
=> I'll get "otherfield" and not "somefield" ?
Can you use the LocalParams _without_ a !defType, to just supply
parameters but take the default defType for the request handler?
&q={qf=somefield} cat dog
And now we move into the nested querries -- for the simplest case nested
query, is it in fact identical to using LocalParams without a nested query?
&q={!dismax qf=something} cat dog
===?
&q=_query_:"{!dismax qf=somefield} cat dog"
Are those equivelent? In nested querries like that, the issue of quote
escaping becomes even more confusing, can I put a literal in there,
and... how?
&q=_query_:"{!dismax qf="somefield^1 otherfield^2"}" ==> obviously
won't work, the quotes are interfering with each other.
Phew, that's a lot of questions, but probably just a start, heh. I'm
trying to wrap my head around the complete possibilities of LocalParams
and nested querries, to figure out if I can use them to do the kind of
complicated thing I'm trying to do.
I guess I could try to test all these things out and figure out the
answer, and probably will proceed to do that if nobody else has any
other advice, but I figured it didn't hurt to ask, and some of these
things will be hard to guess on my own (like the quote escaping issue).
If I figure some stuff out, is there any good community place (wiki
somewhere?) for me to document this stuff for others?
Thanks for any advice,
Jonathan
