The fieldNorm is computed like this: fieldNorm = lengthNorm * documentBoost * documentFieldBoosts
and the lengthNorm is: lengthNorm = 1/(numTermsInField)**.5 [note that the value is encoded as a single byte, so there is some precision loss] So the values are not pre-set for the lengthNorm, but for some counts the fieldLength value winds up being the same because of the precision los. Here is a list of lengthNorm values for 1 to 10 term fields: # of terms lengthNorm 1 1.0 2 .625 3 .5 4 .5 5 .4375 6 .375 7 .375 8 .3125 9 .3125 10 .3125 That's why, in your example, the lengthNorm for 3 and 4 is the same. -Jay http://www.lucidimagination.com On Thu, Mar 11, 2010 at 9:50 AM, muneeb <muneeba...@hotmail.com> wrote: > > > : > : Did you reindex after setting omitNorms to false? I'm not sure whether or > : not it is needed, but it makes sense. > > Yes i deleted the old index and reindexed it. > Just to add another fact, that the titlles length is less than 10. I am not > sure if solr has pre-set values for length normalizations, because for > titles with 3 as well as 4 terms the fieldNorm is coming up as 0.5 (in the > debugQuery section). > > > -- > View this message in context: > http://old.nabble.com/field-length-normalization-tp27862618p27867025.html > Sent from the Solr - User mailing list archive at Nabble.com. > >
