edismax vs dismax

["Thumuluri, Sai" <Sa...@VerizonWireless.com>]

Hi, 

I recently upgraded to Solr 1.4.1 from Solr 1.3 and with the upgrade
used edismax query parser. Here is my solrconfig.xml . When I search for
"mw verification and payment information" - I get no results with 
defType set to edismax, 

if I switch the deftype to dismax - I get the results I am looking for 

Can anyone explain, why this would be the case? I thought edismax is
dismax and more. 

Thank you,

For 1.4.1
<requestHandler name="partitioned" class="solr.SearchHandler"
default="true">
    <lst name="defaults">
     <str name="defType">dismax</str>
     <str name="echoParams">explicit</str>
     <float name="tie">0.01</float>
     <str name="qf">
        body^1.0 title^10.0 name^3.0 taxonomy_names^2.0 tags_h1^5.0
tags_h2_h3^3.0 tags_h4_h5_h6^2.0 tags_inline^1.0
     </str>
     <str name="pf">
        body^10.0
     </str>
     <int name="ps">4</int>
     <str name="mm">
        2&lt;-25%
     </str>
     <str name="q.alt">*:*</str>

     <str name="hl">true</str>
     <str name="hl.fl">body</str>
     <int name="hl.snippets">3</int>
     <str name="hl.mergeContiguous">true</str>
   <!-- instructs Solr to return the field itself if no query terms are
        found -->
     <str name="f.body.hl.alternateField">body</str>
     <str name="f.body.hl.maxAlternateFieldLength">256</str>
     <!--<str name="f.body.hl.fragmenter">regex</str>--> <!-- defined
below --

Sai Thumuluri

Re: edismax vs dismax

[Yonik Seeley <yo...@lucidimagination.com>]

On Fri, Jan 28, 2011 at 3:00 PM, Thumuluri, Sai
<Sa...@verizonwireless.com> wrote:
> I recently upgraded to Solr 1.4.1 from Solr 1.3 and with the upgrade
> used edismax query parser. Here is my solrconfig.xml . When I search for
> "mw verification and payment information" - I get no results with
> defType set to edismax,

It's probably a bit of natural language query parsing in edismax...
- and is treated as AND (the lucene operator) in the appropriate
context (i.e. we won't if it's at the start or end of the query, etc)
- or is treated as OR in the appropriate context

The lowercaseOperators parameter can control this, so try setting
lowercaseOperators=false

-Yonik
http://lucidimagination.com



> if I switch the deftype to dismax - I get the results I am looking for
>
> Can anyone explain, why this would be the case? I thought edismax is
> dismax and more.
>
> Thank you,
>
> For 1.4.1
> <requestHandler name="partitioned" class="solr.SearchHandler"
> default="true">
>    <lst name="defaults">
>     <str name="defType">dismax</str>
>     <str name="echoParams">explicit</str>
>     <float name="tie">0.01</float>
>     <str name="qf">
>        body^1.0 title^10.0 name^3.0 taxonomy_names^2.0 tags_h1^5.0
> tags_h2_h3^3.0 tags_h4_h5_h6^2.0 tags_inline^1.0
>     </str>
>     <str name="pf">
>        body^10.0
>     </str>
>     <int name="ps">4</int>
>     <str name="mm">
>        2&lt;-25%
>     </str>
>     <str name="q.alt">*:*</str>
>
>     <str name="hl">true</str>
>     <str name="hl.fl">body</str>
>     <int name="hl.snippets">3</int>
>     <str name="hl.mergeContiguous">true</str>
>   <!-- instructs Solr to return the field itself if no query terms are
>        found -->
>     <str name="f.body.hl.alternateField">body</str>
>     <str name="f.body.hl.maxAlternateFieldLength">256</str>
>     <!--<str name="f.body.hl.fragmenter">regex</str>--> <!-- defined
> below --
>
> Sai Thumuluri