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https://issues.apache.org/jira/browse/LUCENE-5022?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shai Erera updated LUCENE-5022:
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Attachment: LUCENE-5022.patch
Good questions Mike! They say a test is worth more than a thousand words, so I
added tests and they pass. I guess he answer is Yes! :)
> 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, 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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