[ https://issues.apache.org/jira/browse/LUCENE-3957?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Adrien Grand resolved LUCENE-3957. ---------------------------------- Resolution: Invalid We don't support index-time boosts anymore. > Document precision requirements of setBoost calls > ------------------------------------------------- > > Key: LUCENE-3957 > URL: https://issues.apache.org/jira/browse/LUCENE-3957 > Project: Lucene - Core > Issue Type: Improvement > Components: general/javadocs > Affects Versions: 3.5 > Reporter: Jordi Salvat i Alabart > Priority: Major > > The behaviour of index-time boosts seems pretty erratic (e.g. a boost of 8.0 > produces the exact same score as a boost of 9.0) until you become aware that > these factors end up encoded in a single byte, with a three-bit mantissa. > This consumed a whole day of research for us, and I still believe we were > lucky to spot it, given how deeply dug into the code & documentation this > information is. > I suggest adding a small note to the JavaDoc of setBoost methods in Document, > Fieldable, FieldInvertState, and possibly AbstractField, Field, and > NumericField. > Suggested text: > "Note that all index-time boost values end up encoded using > Similarity.encodeNormValue, with a 3-bit mantissa -- so differences in the > boost value of less than 25% may easily be rounded away." -- This message was sent by Atlassian JIRA (v7.6.3#76005) --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@lucene.apache.org For additional commands, e-mail: dev-h...@lucene.apache.org