Is it generally recognized that this terminology is confusing, or is it just
me?
I do understand what they do (at least well enough to use them), but I find it
confusing that it's called "defType" as a main param, but "type" in a
LocalParam, when to me they both seem to do the same thing -- which I think
should probably be called 'queryParser' rather than 'type' or 'defType'.
That's what they do, choose the query parser for the query they apply to,
right? (And if they did/do different things, 'defType' vs 'type' doesn't
really provide much hint as to what!)
These are both the same, right, but with different param names depending on
position:
&defType=lucene&q=foo
&q={!type=lucene}foo # uri escaping not shown
(and then there's 'qt', often confused with defType/type by newbies, since they
guess it stands for 'query type', but which should probably actually have been
called 'requestHandler'/'rh' instead, since that's what it actually chooses,
no? It gets very confusing).
If it's generally recognized it's confusing and perhaps a somewhat inconsistent
mental model being implied, I wonder if there'd be any interest in renaming
these to be more clear, leaving the old ones as aliases/synonyms for backwards
compatibility (perhaps with a long deprecation period, or perhaps existing
forever). I know it was very confusing to me to keep track of these parameters
and what they did for quite a while, and still trips me up from time to time.
Jonathan
________________________________________
From: ysee...@gmail.com [ysee...@gmail.com] on behalf of Yonik Seeley
[yo...@lucidimagination.com]
Sent: Tuesday, July 19, 2011 9:40 PM
To: solr-user@lucene.apache.org
Subject: Re: defType argument weirdness
On Tue, Jul 19, 2011 at 1:25 PM, Naomi Dushay <ndus...@stanford.edu> wrote:
> Regardless, I thought that defType=dismax&q=*:* is supposed to be
> equivalent to q={!defType=dismax}*:* and also equivalent to q={!dismax}*:*
Not quite - there is a very subtle distinction.
{!dismax} is short for {!type=dismax}, the type of the actual query,
and this may not be overridden.
The defType local param is only the default type for sub-queries (as
opposed to the current query).
It's useful in conjunction with the "query" or nested query qparser:
http://lucene.apache.org/solr/api/org/apache/solr/search/NestedQParserPlugin.html
-Yonik
http://www.lucidimagination.com
