In SoLR, We can set sortMissingLast=true on a field in the schema. If the SORT is on this field, it will to push the results which have missing field values to the end.
Is there a way to filter out the results whose sort field values are missing? Please advise.
If you want to restrict your query to documents that only have a certain field set, add the following parameter to your query:
sort_field_name:[* TO *]
This will limit the query to only those documents where the sort field exists.
Related
I am using Facet in my solr implemententation. Facets are display for all the keywords of fields having concrete values.
Facets are not displayed for the empty values. I want to show a facets for empty values as well.
For example, in below example data facet is displayed for the value in Country field as
Sample Data for Solr fields
US (6)
CA (5)
IND (5)
I also want to show facet as
[Empty] (7)
Please suggest some workaround to get Facet for empty values.
You can use facet.missing to get a count for the number of documents that doesn't have a value in the field.
The facet.missing Parameter
If set to true, this parameter indicates that, in addition to the Term-based constraints of a facet field, a count of all results that match the query but which have no facet value for the field should be computed and returned in the response.
The default value is false.
This parameter can be specified on a per-field basis with the syntax of f.<fieldname>.facet.missing.
I have a field in solr of type list of texts.
field1:{"key1:val1,key2:val2,key3:val3", "key1:val1,key2:val2"}
I want to form a query such that when I search for key1:val1 and key3:val3 I get the result who has both the strings i.e key1:val1 and key3:val3.
How shall I form the query?
If these are values in a multivalued field, you can't - directly. You'll have to use something like highlighting to tell you where Solr matched it.
There is no way to tell Solr "I only want the value that matched inside this set of values".
If this is a necessary way to query your index, index the values as separate documents instead in a separate collection. In that case you'd have to documents instead, one with field1:"key1:val1,key2:val2,key3:val3" and one with key1:val1,key2:val2.
You can use AND with fq.
Like:
fq=key1:val1 AND key3:val3
With this filter query you will get only records where key1 = val1 AND key3 = val3.
I have a local SOLR server with some entries that have a field "debaTest": "" while some entries don't have this field at all.
Is there a way in Solr to filter out the entries that have this field? the value for the field will always be null or empty.
Please note: Something in the lines of q=-debaTest:[* TO *] or
-debaTest:* won't work for my requirement as this returns the entries that don't have these fields at all and I want the entries that have this field but without a value.
In solr i have a multiValued field called animal and it has the values {cat,dog} is it possible to get the number of values inside the multiValued field in solr(in my example 2)?
If you want to count the items in a multivalued field use CountFieldValuesUpdateProcessorFactory
There is no direct way to get the count of items in a multivalued field.
You can always maintain the field count during indexing and use it.
If not using during query time, you can always count the list size.
I am using SolrMeter to test Apache Solr search engine. The difference between Facet fields and Filter queries is not clear to me. SolrMeter tutorial lists this as an exapmle of Facet fields :
content
category
fileExtension
and this as an example of Filter queries :
category:animal
category:vegetable
categoty:vegetable price:[0 TO 10]
categoty:vegetable price:[10 TO *]
I am having a hard time wrapping my head around it. Could somebody explain by example? Can I use SolrMeter without specifying either facets or filters?
Facet fields are used to get statistics about the returned documents - specifically, for each value of that field, how many returned documents have that value for that field. So for example, if you have 10 products matching a query for "soft rug" if you facet on "origin," you might get 6 documents for "Oklahoma" and 4 for "Texas." The facet field query will give you the numbers 6 and 4.
Filter queries on the other hand are used to filter the returned results by adding another constraint. The thing to remember is that the query when used in filtering results doesn't affect the scoring or relevancy of the documents. So for example, you might search your index for a product, but you only want to return results constrained by a geographic area or something.
A facet is an field (type) of the document, so category is the field. As Ansari said, facets are used to get statistics and provide grouping capabilities. You could apply grouping on the category field to show everything vegetable as one group.
Edit: The parts about searching inside of a specific field are wrong. It will not search inside of the field only. It should be 'adding a constraint to the search' instead.
Performing a filter query of category:vegetable will search for vegetable in the category field and no other fields of the document. It is used to search just specific fields rather than every field. Sometimes you know that the term you want only is in one field so you can search just that one field.