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From Yonik Seeley <>
Subject Re: missing "q" gives 500 error
Date Thu, 09 Sep 2010 19:02:14 GMT
On Thu, Sep 9, 2010 at 2:40 PM, Chris Hostetter
<> wrote:
> : > I don't think so ... that's what q.alt is for.
> :
> : q.alt is for dismax.
> : What's wrong with matching no documents if no query is specified?
> : It's actually more consistent when someone tries to specify a
> : zero-length query (i.e. q=)
> My bad - i was mistakenly thinking we had promoted q.alt to be a
> QueryComponent param.
> where are you suggesting we make the change? to QueryComponent or to the
> LuceneQParser?
> It makes sense in principle, but seems like QueryComponent shouldn't make
> any assumptions if there is no "q" param - the QParser might have it's own
> special rules (like DisMaxQParser and q.alt).

Right, that's why I was thinking the LuceneQParser.

> but if we put it in the
> QParser, then every QParser that doesn't have special logic needs to deal
> with it consistently.
> Off the top of my head: we can make the QParsers return null if they
> consider the request "valid" but containing no meaningful query (ie: blank
> or missing q param) and then make QueryComponent short circut when the
> Query object is null.

Hmmm, that may be an even better idea.

-Yonik  Lucene/Solr Conference, Boston Oct 7-8

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