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Posted to dev@lucene.apache.org by "Shai Erera (JIRA)" <ji...@apache.org> on 2013/05/29 15:11:20 UTC

[jira] [Resolved] (LUCENE-5022) Add FacetResult.mergeHierarchies

     [ https://issues.apache.org/jira/browse/LUCENE-5022?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Shai Erera resolved LUCENE-5022.
--------------------------------

       Resolution: Fixed
    Fix Version/s: 4.4
                   5.0
    Lucene Fields: New,Patch Available  (was: New)

Committed to trunk and 4x.
                
> 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
>             Fix For: 5.0, 4.4
>
>         Attachments: LUCENE-5022.patch, 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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