[jira] [Created] (LUCENE-4709) Nuke FacetResultNode.residue

["Shai Erera (JIRA)" <ji...@apache.org>]

Shai Erera created LUCENE-4709:
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             Summary: Nuke FacetResultNode.residue
                 Key: LUCENE-4709
                 URL: https://issues.apache.org/jira/browse/LUCENE-4709
             Project: Lucene - Core
          Issue Type: Improvement
          Components: modules/facet
            Reporter: Shai Erera
            Assignee: Shai Erera


The residue is the count of all categories that did not make it to the top K. But, this is a senseless statistic. Take for example the following case: two documents with categories [A/1, A/2, A/3] and [A/1, A/4, A/5]. If you ask for top-1 category of "A", you'll get A (count=2), A/1 (count=2), but A's residue will be 4!

As a user, that number doesn't tell you anything, except maybe when you index only one category per document for a given dimension. But in that case, the residue is {{root.value - sum(topK.value)}}, which the application can compute if it needs to.

In short, we're just wasting CPU cycles for that statistic, so I'm going to remove it.

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