Results > Manipulate the Results Set > Combine Parameter > FieldCheck

FieldCheck
The FieldCheck option combines results based on the hash value of their FieldCheckType field. The FieldCheckType field holds a value that is frequently used to restrict results (for example, a field that stores category names). When IDOL server indexes a FieldCheckType field, it stores it in a fast look-up table in memory, so it can return quickly.
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For example:
http://IDOLhost:port/action=Query&Text=The best thing to do in your spare time&Combine=FieldCheck
In this example, IDOL server is configured to store the Category field as a FieldCheckType field.
If IDOL server contains 50 documents that match the query text, of which eight contain a Category field with the value Sport, five contain a Category field with the value Gardening and one contains a Category field with the value Cooking, the above query returns only three results:
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the most relevant of the documents whose Category contains the value Sport
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the most relevant of the documents whose Category contains the value Gardening
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the document whose Category contains the value Cooking.
 
NOTE If you set URLAnalysis to true in your IDOL server configuration file [Server] section, you cannot identify a field as a FieldCheckType field, as IDOL server automatically uses the domain of the URL it finds in the document ReferenceType fields as the FieldCheck value.