bq: Is the Filter Cache used for the OR'ed fq? The filter cache is actually pretty simple conceptually. It's just a map where the key is the fq and the value is the set of documents that satisfy that fq (we'll skip the implementation here, just think of it as the list of all the docs that the fq selects).
Solr doesn't attempt to do much with the key, just think of it as a single string. Whether or not an fq is reused from the cache depends upon whether the key is in the map. So fq=id:(1 OR 2 OR 3) will just look to see if "id:(1 OR 2 OR 3)" is a key. If so, it'll just use the document list stored in the cache. It won't match "id:(1 OR 2)" or "id:(2) or "id:1 OR id:2 OR id:3" In other words, there's no attempt to decompose the fq clause and store parts of it in the cache, it's exact-match or nothing. Hope that helps Erick On Mon, Feb 13, 2012 at 2:17 PM, <spr...@gmx.eu> wrote: > Hi, > > how efficent is such an query: > > q=some text > fq=id:(1 OR 2 OR 3...) > > Should I better use q:some text AND id:(1 OR 2 OR 3...)? > > Is the Filter Cache used for the OR'ed fq? > > Thank you >