You'll probably get a better response from solr-users. In any case, posting the relevant fieldtype definition from your schema.xml and, for good measure, the results of a query with debugQuery on would be helpful. Off the top of my head, I'd say it may be a combination of not using index time expansion on the synonym filter (query time expansion on multi-word synonyms can be wonky) and a word delimiter filter that's configured to split on numerics, i.e. "co2" => "co", "2".

M

On 05/27/2011 07:43 AM, Thomas Dowling wrote:
Greetings--

I'm trying to flesh out my synonyms.txt file for a couple of Solr indexes,
and I stumbled across something weird.  I added these lines to synonyms.txt:

co2, carbon dioxide
ch4, methane


The second line worked as expected: I restarted Solr, reindexed, and could
search ch4 and methane as synonyms of each other.

The first line did something weird.  Before the change, I can get results
for both CO2 and for "CARBON DIOXIDE" (just different results).  After the
change, searching CO2 got zero results, as did "CARBON DIOXIDE".  So at
least they're acting like synonyms, right?  But why in the world do they
both stop finding hits?

Pre-change:
   CO2                  225 hits
   "CARBON DIOXIDE"   130 hits
   CARBON DIOXIDE       1030 hits

Post-change:
   CO2                  0 hits
   "CARBON DIOXIDE"   0 hits
   CARBON DIOXIDE       1030 hits


Also, if I want to be able to search for Greek letters by name (alpha,
beta, etc.), is there a better way than to use synonmyms.txt?

   Δ,δ,delta


TIA

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