I agree with you the documentation should be more explicit. I just don't want to give new users the impression that stored fields won't return in the order they are added. This is the behavior and I think a lot of us rely on that today.
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 11:35 AM To: solr-user@lucene.apache.org Subject: Re: "order" question on solr multi value field "A multi-valued field is the same as a single-valued field with the positions artifically incremented" Yes, for the INDEX. But the concept of Lucene-level "positions" is not relevant to STORED values. I'm not sure why you are confusing the two. A single string has guaranteed order of the characters in the string - nobody was disputing that! Sure, you can argue that the contract is semi-sort-of-implied, but the point is that we should make it explicit. If I have time later today I'll file the Jira. -- Jack Krupansky -----Original Message----- From: Dyer, James Sent: Tuesday, December 18, 2012 12:08 PM To: solr-user@lucene.apache.org Subject: RE: "order" question on solr multi value field I suppose using this same logic you can not guarantee the tokens on a stored, single-value field would be stored in the order they arrive either, can you? A multi-valued field is the same as a single-valued field with the positions artifically incremented, so what's the difference? 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 10:16 AM To: solr-user@lucene.apache.org Subject: Re: "order" question on solr multi value field Ah, good points, but only for the INDEXED data, not the STORED data! I believe the concern is the stored values that are returned from a query. Although the question does also apply to how a span query would work for a multi-valued field. -- Jack Krupansky -----Original Message----- From: Dyer, James Sent: Tuesday, December 18, 2012 10:54 AM To: solr-user@lucene.apache.org Subject: RE: "order" question on solr multi value field 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.
