Shai Erera created LUCENE-5022:
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Summary: 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
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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