Teun Duynstee created SOLR-4496:
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Summary: Support for faceting on the start of values
Key: SOLR-4496
URL: https://issues.apache.org/jira/browse/SOLR-4496
Project: Solr
Issue Type: Improvement
Components: search
Reporter: Teun Duynstee
Priority: Minor
The SimpleFacets component supports the prefix parameter to return only facets
starting with that prefix. This feature should (IMO) be complemented by two
more parameters to make it much more usefull (names could be improved on of
course):
- limitLength: will return facets for only the first x characters of the real
facets. If the real values are AAA, CC and CCC, the limitLength=1 parameter
would cause the facets A and C to be returned, with the sum of the counts. This
could typpically be used for a UI that allows you to select a first letter for
fields with many facets.
- limitDelim: this would not truncate on a fixed length, but on the occurence
of a certain character after the prefix. This would allow the user to search
for hierarchical fields without having to resort to including each level of the
hierarchy at index analysis. This way, the value of the filed cat would be
'Comics>Marvel>Batman' and this would be found using
prefix=Comics>&limitDelim=>. This would return the facet Marvel with the
combined count for all undelying cat values.
I am working on a patch that would achieve this by postprocessing the resulting
counts in getTermCounts(). However, this will not return the correct counts for
multivalued fields. Also, the combination with field.limit is not easy. Any
tips for how to implement this? I'm available to work on a patch. Or is it a
bad adie anyway?
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