My solr index contains documents which have a field named department. This field is a multivalue non-required int field. I want to construct a query whose result must be union of
All the documents that do not contain the field department
All the documents that contain the field department, but the values of the field are restricted to a selected few.
I tried constructing the query that looks like so:
-department:* OR (department:* AND department:(100 OR 200))
This doesn't return any results. Whereas if I just just use
-department:*
or
department:* AND department:(100 OR 200)
, the query seems to work well. In short I'm having trouble understanding the behavior of OR clause in this context. Any pointers?
Checkout SolrQuerySyntax
Pure Negative Queries :-
-field:[* TO *] finds all documents without a value for field
You can try :-
q=-department:[* TO *] OR department:(100 OR 200)
To achieve what you want, I think you can use Solr grouping.
You can give something like,
&q=*&group=true&group.query=department:[100]&group.query=department:[200]&group.query=-department:[*]
Related
Our service's default search web page uses the * full Lucene query to match all documents. This is before the user has provided any search terms. There is some data (test data, in our case) that we want to exclude from the search result.
Is it possible to match all documents but exclude a subset of all documents?
For example, suppose we have an "owners" field and we want to exclude documents with the "testA" and "testB" owner. The following query does not seem to work with the match all approach:
Query: search=* -owners:testA -owners:testB&queryType=full&$orderby=created desc
Error: "Failed to parse query string. See https://aka.ms/azure-search-full-query for supported syntax."
When searching for anything but *, this approach works fine. For example:
Query: search=foo -owners:testA -owners:testB&queryType=full&$orderby=created desc
Result: (many documents matched)
I have considered a $filter for this and using $filter=filterableOwners/all(p: p ne 'testa' and p ne 'testb') but this has the following drawbacks:
the index must be rebuild with a filterable field
analyzers can't be used so case-insensitivity must be implemented by lowercasing the values and filter expression
Ideally this could be done using only the search query parameter with a Lucene query text.
I found a workaround for the issue. If you have a field in your documents that always has a value, you can use a .* regex to match all values in the field and therefore match all documents.
For example, suppose the packageId field has a value for all documents.
Incorrect (as posted in the original question):
Query: search=* -owners:testA -owners:testB&queryType=full&$orderby=created desc
Correct:
Query: search=packageId:/.*/ -owners:testA -owners:testB&queryType=full&$orderby=created desc
What's the difference between these two solr queries:
NOT name:*
NOT name:[* TO *]
Both of the two can return some results.But I can't discriminate the difference.
Based on reading the documentation for SOLR query.
NOT name:[* TO *]
removes all documents with the name and whatever value name contains, as shown on this documentation: https://wiki.apache.org/solr/SolrQuerySyntax
NOT name:*
removes all member fields belonging to name.
NOT is a keyword reserve in removing results of whatever field + value. They show you different results because if you specify a value to NOT name:[* TO *], you are bound to get results that exclude from the rule you've specified.
Keep in mind that SOLR query employs certain regex rules.
I am trying to query Solr with following requirement:
_ I would like to get all documents which not have a particular field
-exclusivity:[* TO *]
I would like to get all document which have this field and got the specific value
exclusivity:(None)
so when I am trying to query Solr 4 with:
fq=(-exclusivity:[* TO *]) OR exclusivity:(None)
I have only got results if the field exists in document and the value is None but results not contain results from first query !!
I cannot understand why it is not working
To explain your results, the query (-exclusivity:[* TO *]) will always get no results, because you haven't specified any result to retrieve. By default, Lucene doesn't retrieve any results, unless you tell it to get them. exclusivity:(None) isn't a limitation placed on the full result set, it is the key used to find the documents to retrieve. This differs from a database, which by default returns all records in a table, and allows you to limit the set.
(-exclusivity:[* TO *]) only specifies what NOT to get, but doesn't tell it to GET anything at all.
Solr has logic to handle Pure negative queries (I believe, in much the same way as below, by implicitly retrieving all documents first), but from what I gather, only as the top level query, and it does not handle queries like term1 OR -term2 documented here.
I believe with solr you should be able to use the query *:* to get all docs (though that would not be available in raw lucene), so you could use the query:
(*:* -exclusivity:[* TO *]) exclusivity:(None)
which would mean, get (all docs except those with a value in exclusivity) or docs where exclusivity = "None"
I have founded answer to this problem. I have made bad assumption how "-" works in solr.I though that
-exclusivity:[* TO *]
add everything without exclusivity field to the data set but it is not the case. The '-' could only exclude things from data set. BTW femtoRgon you are right but I am using it as fq (filter query) not as a master query I have forgotten to mention that.
So the solution is like
-exclusivity:([* TO *] AND -(None))
and full query looks like
/?q=*:*&fq=-exclusivity:([* TO *] AND -(None))
so that means I will get everything does not have field exclusivity or has this field and it is populated with value None.
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.
Is it possible to boost fields that appear in filter queries (fq=) in Solr?
I have a faceted query that has a tagged filter query something like this:
...&q=*:*&fq={!tag:X}brand:(+"4911")+OR+body:(abc)&facet.field={!ex:X}brand&..
(I facet on brand and the facet is set to ignore the filter query tagged X, so I need to use a filter query.)
I would like to make matches on the brand field score higher than matches on body field in the filter query.
The fields brand and body are multivalued.
I've tried adding bf=/bq= arguments, and I can get brand matches to score higher if I change the filter query to be the main 'q=' query, but I don't seem to be able to influence the score of anything in the filter query. I think I maybe going about it in the wrong way..
Thanks.
Solr "fq"'s do not affect score -- see the wiki. So, you should add your queries to "q" that you actually want to boost. If need be, you can always duplicate a query restriction in both "q" and "fq", as "fq" only acts as a restriction on the results set.