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Posted to dev@lucene.apache.org by "Michael McCandless (JIRA)" <ji...@apache.org> on 2013/05/28 22:27:20 UTC
[jira] [Commented] (LUCENE-5022) Add FacetResult.mergeHierarchies
[ https://issues.apache.org/jira/browse/LUCENE-5022?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13668642#comment-13668642 ]
Michael McCandless commented on LUCENE-5022:
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This looks great Shai! Can it be used for non-hierarchical dims as well? E.g. if I have one FacetRequest for top 10 under User/ and then a second FacetRequest for User/Bob (a "leaf" ... hmm can one make a FacetRequest like that?), will it merge them?
Or, what would it do if I (oddly) had one FacetRequest asking for top 10 under User/ and another FacetRequest asking for top 20 under User/?
> Add FacetResult.mergeHierarchies
> --------------------------------
>
> Key: LUCENE-5022
> URL: https://issues.apache.org/jira/browse/LUCENE-5022
> Project: Lucene - Core
> Issue Type: New Feature
> Components: modules/facet
> Reporter: Shai Erera
> Assignee: Shai Erera
> Priority: Minor
> Attachments: LUCENE-5022.patch
>
>
> When you DrillSideways on a hierarchical dimension, and especially when you OR multiple drill-downs together, you get several FacetResults back, one for each category you drill down on. So for example, if you want to drill-down on Date/2010 OR Date/2011/May, the FacetRequests that you need to create (to get the sideways effect) are: Date/, Date/2010, Date/2011 and Date/2011/May. Date/ is because you want to get sideways counts as an alternative to Date/2010, and Date/2011 in order to get months count as an alternative to Date/2011/May.
> That results in 4 FacetResult objects. Having a utility which merges all FacetResults of the same dimension into a single hierarchical one will be very useful for e.g. apps that want to display the hierarchy. I'm thinking of FacetResult.mergeHierarchies which takes a List<FacetResult> and returns the merged ones, one FacetResult per dimension.
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