Let us see how the collector and scorer work together to calculate the results for both OR and AND clauses. Let us first focus on the OR clause. Considering the earlier index, suppose we perform the following search:

orange OR strawberry OR not

A search for orange OR strawberry OR not

On the basis of the terms in the query, Doc Id 1 was rejected during the Boolean filtering logic. We will need to introduce the concept of accumulator here. The purpose of the accumulator is to loop through each term in the query and pass the documents that contain the term to the collector.

In the present case, when the accumulator looks for documents containing orange, it gets documents 2 and 3. The output of the accumulator in this case is 2x1, 3x1, where 2 and 3 are the document IDs and 1 is the number of times the term orange occurs in both the documents.Next, it will process the term strawberry where it will get document ID 3. Now, the accumulator outputs 3x1 that adds to our...