Re: pg_trgm module: no convertion into Trigrams on one side when comparing

Hi Amit,
 
Thanks for your answer.

My issue is that I still need a ranking like the similarity when comparing trigrams.
I'm working on a similarity search, which determindes similiar sentences from my table.

The usual similarity search with Trigrams and a gist bzw. gin index is to slow with my set of rows.

So I've built an Fixed Query Array. I took some sentences as pivots and calculated the distance between them and all my sentences.
Now I can search for similiar sentences by calculating their distance to my pivots and comparing them with the distances I already got.
I noticed that it's a good way to use trigrams as metric distance function.
 
So the issue is that I have to take certain trigrams as pivots and of cource I need to store an exact ranking when comparing.
Your method detect the rows which includes all of the trigrams you are searching for, but I still need a ranking...

something like SELECT similarity('How are your', "{" ho","how","are","re "," hi","wha","hat","at "," a"}"::trgm);
 
I hope you have an idea
 
Janek Sendrowski