We had a comparable situation. We created an extra field and at index time copy the value if there is one and create a unique dummy value if there is none. We couldn't just make the initial field required, because it has a meaning other than just a grouping key. Teun Op 22 feb. 2013 20:47 schreef "Daniel Collins" <danwcoll...@gmail.com> het volgende:
> We had something similar to be fair, a cluster information field which was > unfortunately optional, so all the documents that didn't have this field > set grouped together. > > It isn't Solr's fault, to be fair, we told it to group on the values of > field Z, null is a valid value and lots of documents have that value so > they all group together. We got what we asked for :-) > > Our solution was to make that field mandatory, and in our indexing > pipeline we will set that field to some unique value (same as the document > key if necessary) if it isn't set already to ensure that every document has > that field set appropriately. > > -----Original Message----- From: Oussama Jilal > Sent: Friday, February 22, 2013 5:25 PM > To: solr-user@lucene.apache.org > Subject: Re: Solr Grouping and empty fields > > OK I'm sorry if I did not explained well my need. I'll try to give a > better explanation. > > What I have : Millions of documents that have a field X , another field > Y and another field Z which is not required (So it can be empty in some > documents and not in others). > > What I want to do : Search for docs that have the field X equals > something and group them by field Z (so that only 1 document is returned > for every field Z value), BUT I want documents who have field Z as empty > to be included in the results (all of them), and sort the results by > field Y (so I can't separate the request into two requests). > > I hope that this is clearer. > > > On 02/22/2013 03:59 PM, Jack Krupansky wrote: > >> What?!?! You want them grouped but not grouped together?? What on earth >> does that mean?! I mean, either they are included or they are not. All >> results will be in some group, so where exactly do you want these "not to >> be grouped together" documents to be grouped? In any case, please clarify >> what your expectations really are. >> >> -- Jack Krupansky >> -----Original Message----- From: Oussama Jilal >> Sent: Friday, February 22, 2013 7:17 AM >> To: solr-user@lucene.apache.org >> Subject: Re: Solr Grouping and empty fields >> >> Thank you Johannes, but I want the documents having the field empty to >> be included in the results, just not to be grouped together, and if I >> understood your solution correctly, it will simply remove those >> documents from the results (Note : The field values are very variable >> and unknown to me). >> >> On 02/22/2013 02:53 PM, Johannes Rodenwald wrote: >> >>> Hi Oussama, >>> >>> If you have only a few distinct, unchanging values in the field that you >>> group upon, you could implement a FilterQuery (query parameter "fq") and >>> add it to the query, allowing all valid values, but not an empty field. For >>> example: >>> >>> fq=my_grouping_string_field:( value_a OR value_b OR value_c OR value_d ) >>> >>> If you use SOLR 4.x, you should be able to group upon an integer field, >>> allowing a range filter: >>> (I still work with 3.6 which can only group on string fields, so i didnt >>> test this one) >>> >>> fq=my_grouping_integer_field:[**1 TO *] >>> >>> -- >>> Johannes Rodenwald >>> >>> >>> ----- Ursprüngliche Mail ----- >>> Von: "Oussama Jilal" <jilal.ouss...@gmail.com> >>> An: solr-user@lucene.apache.org >>> Gesendet: Freitag, 22. Februar 2013 12:32:13 >>> Betreff: Solr Grouping and empty fields >>> >>> Hi, >>> >>> I need to group some results in solr based on a field, but I don't want >>> documents having that field empty to be grouped together, does anyone >>> know how to achieve that ? >>> >>> >> > -- > Oussama Jilal > >
