I would say such a guarantee is implied by the javadoc to Analyzer#getPositionIncrementGap . It says this value is an "increment" to be "added to the next token emitted from tokenStream."
http://lucene.apache.org/core/4_0_0-ALPHA/core/org/apache/lucene/analysis/Analyzer.html#getPositionIncrementGap%28java.lang.String%29 Also compare unofficial documentation such as Lucene In Action 2nd ed, section 4.7.1: "Lucene logically appends the tokens...sequentially." Having multi-valued fields stay in the order in which they were added to the Document is a guarantee that many many users depend on. James Dyer E-Commerce Systems Ingram Content Group (615) 213-4311 -----Original Message----- From: Jack Krupansky [mailto:j...@basetechnology.com] Sent: Tuesday, December 18, 2012 9:30 AM To: solr-user@lucene.apache.org Subject: Re: "order" question on solr multi value field If there is no "official" guarantee in the Javadoc for the code then there is no official guarantee. Period. If somebody wants an official, contractual guarantee, a Jira should be filed to do so. To put it simple, are the values a "list" or a "set"? -- Jack Krupansky -----Original Message----- From: Erik Hatcher Sent: Tuesday, December 18, 2012 9:40 AM To: solr-user@lucene.apache.org Cc: solr-user@lucene.apache.org Subject: Re: "order" question on solr multi value field I don't know of an "official" guarantee of maintaining order but it's definitely guaranteed an relied upon to retain order. Many will scream if this changed. Indexed doesn't matter here because what you get back are the stored values no matter if the field is indexed or not. Erik On Dec 18, 2012, at 3:04, hellorsanjeev <sanjeev.dhi...@3pillarglobal.com> wrote: > thank you for quick response :) > > I also have the same observation and I too believe that there is no reason > for Solr to reorder a multi value field. > > But would you stay firm on your conclusion if I say that my multi value > field was indexed? > > Please note - as per my one year experience with Solr, it always returned > the values in the insertions order irrespective of the fact that field was > indexed or not. > > My main concern is because I couldn't find it documented anywhere, it > might > happen that in Solr 4.0 or later, they start reordering them. If they do > then there will be a big problem for us :) > > > > -- > View this message in context: > http://lucene.472066.n3.nabble.com/order-question-on-solr-multi-value-field-tp4027695p4027713.html > Sent from the Solr - User mailing list archive at Nabble.com.
