Hi Darko,

The issue is the wrong expectations: title-1-end is parsed to 3 tokens (guessing) and mm=99% of 3 tokens is 2.99 and it is rounded down to 2. Since all your documents have 'title' and 'end' tokens, all match. If you want to round up, you can use mm=-1% - that will result in zero (or one match if you do not filter out original document).

You have to play with your tokenizers and define what is similarity match percentage (if you want to stick with mm).

Regards,
Emir


On 28.08.2017 09:17, Darko Todoric wrote:
Hm... I cannot make that this DisMax work on my Solr...

In solr I have document with title:
 - "title-1-end"
 - "title-2-end"
 - "title-3-end"
 - ...
 - ...
 - "title-312-end"

and when I make query "*http://localhost:8983/solr/SciLit/select?defType=dismax&indent=on&mm=99%&q=title:"title-123123123-end"&wt=json*' I get all documents from solr :\
What I doing wrong?

Also, I don't know if affecting results, but on "title" field I use "WhitespaceTokenizerFactory".

Kind regards,
Darko


On 08/25/2017 06:38 PM, Junte Zhang wrote:
If you already have the title of the document, then you could run that title as a new query against the whole index and exclude the source document from the results as a filter.

You could use the DisMax query parser: https://cwiki.apache.org/confluence/display/solr/The+DisMax+Query+Parser

And then set the minimum match ratio of the OR clauses to 90%.

/JZ

-----Original Message-----
From: Darko Todoric [mailto:todo...@mdpi.com]
Sent: Friday, August 25, 2017 5:49 PM
To: solr-user@lucene.apache.org
Subject: Search by similarity?

Hi,


I have 90.000.000 documents in Solr and I need to compare "title" of this document and get all documents with more than 80% similarity. PHP have "similar_text" but it's not so smart inserting 90m documents in the array... Can I do some query in Solr which will give me the more the 80% similarity?


Kind regards,
Darko Todoric

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Darko Todoric
Web Engineer, MDPI DOO
Veljka Dugosevica 54, 11060 Belgrade, Serbia
+381 65 43 90 620
www.mdpi.com

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