Lucene guarantees the order of all stored fields returned. Solr guarantees the order of all values in a *specific* field, but not the fields themselves.
-Yonik On Tue, Dec 16, 2008 at 10:00 AM, Patrick Johnstone <pjohnst...@dejavunet.net> wrote: > > I'm using Lucene via Solr and recently upgraded from an early Summer nightly > build to the released version of Solr 1.3 (which seems to use something in > the neighborhood of Lucene 2.3). I'm posting this here because I believe > that my issue is with Lucene, not Solr. > > After the upgrade, I noticed that the order of fields being returned for > documents had changed. Previously, the order of fields being returned was > the same as the order in which they were added to the document (which is > what's stated in the FAQ and other places I came across but not specifically > spelled out in the Javadoc). > Now, the fields always seem to come back in lexicographic order by field > name. > > I believe (but am by no means sure) that this is being caused by the > following bit of code in DocFieldProcessorPerThread.java: > > // If we are writing vectors then we must visit > // fields in sorted order so they are written in > // sorted order. TODO: we actually only need to > // sort the subset of fields that have vectors > // enabled; we could save [small amount of] CPU > // here. > quickSort(fields, 0, fieldCount-1); > > for(int i=0;i<fieldCount;i++) > fields[i].consumer.processFields(fields[i].fields, > fields[i].fieldCount); > > This code seems to sort the fields of the document into order before > processing them. If this is true, then the original field order is lost and > can't ever be recovered. (None of the fields in our index use TermVectors.) > > My questions are: Is my reading of this behavior correct? ...and... > if so: Is there some other way to get the original order back? > > The application that I'm building took some advantage of the fact that the > fields were returned in the orignial order (becuase the order had some > meaning) and it may be difficult for me to work around this change. > > Patrick Johnstone > DejaVu Networks > pjohnst...@dejavunet.net > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org > For additional commands, e-mail: java-user-h...@lucene.apache.org > > --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
