问题
The last option to solve this for me was to ask StackOverflow.
I am trying to create a Solr query to get documents that have a specific value on one of its fields OR that does not have a value...
Theorically, this query should have worked.
Here is some information:
Query: (name: john) --> Result count: 15383 //Johns
Query: (name: {* TO *}) --> Result count: 61013 //People that have a name
Query: -(name: {* TO *}) --> Result count: 216888 //People that do not have a name
Now, when I use first and third query in a same query with OR operator, I expect to get (216888 + 15383) results. But SOLR gives 15383 results, simply ignores the effect of third query:
Query: +((name:john) (-(name:{* TO *}))) //This is the query I was used.
Is this a bug of Solr or am I doing wrong in query? Merging two query results is an additional solution but I do not want to do extra code implementation if I could do it with a simple query.
Any help would be appreciated.
回答1:
(-name:[* TO *] AND *:*) OR name:john
回答2:
You can also use it like this.
&fq=name:john OR !name:['' TO *]
回答3:
try the below query -
q=(name:john OR -(name:[* TO *]))
来源：https://stackoverflow.com/questions/7672259/how-to-or-null-value-in-apache-solr-query