All,
We had a requirement in our solr powered application where customers want
to see all the documents that have a blank value for a field. So when they
facet on a field, if the field has null values, they should be able select
that facet value and see all documents. I thought facet.missing=true was
the answer.
When I set facet.missing=true in solrconfig.xml, I expected to get facet
values that are null along with their count. However, when there is no null
value, I do not want the null to be returned along with a count of zero,
which is what is happening now.
Background information: Using SolrJ with Solr 3.4 and jdk7
Sample program
SolrQuery facquery= new SolrQuery();
facquery.setQuery("*:*");
facquery.addFilterQuery("Field2:\"ISC\"");
facquery.setRows(0);
facquery.setFacet(true);
facquery.setFacetMinCount(1);
facquery.setFacetLimit(2);
String[] orderedFacetList = new String[] {"Field1", "Field2", "Field3"};
for(int i=0; i < orderedFacetList.length; i++) {
facquery.addFacetField(orderedFacetList[i]);
}
try {
facResponse = server.query(facquery);
}catch(SolrServerException ex) {
}
FacetField ff1=facResponse.getFacetField("Field2");
int count = ff1.getValueCount();//This gives count of 2
List<FacetField.Count> flist = ff1.getValues(); //The values are [ISC
(1077), null (0)]
In the above program, I am applying a filter on the field Field2 with a
value ISC. So the results will be only documents that have ISC for Field2.
My expectation is that flist in above program should only return [ISC
(1077)].
Appreciate any pointers on this. Thank you
- Rahul
