add Terms.docCount
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Key: LUCENE-3423
URL: https://issues.apache.org/jira/browse/LUCENE-3423
Project: Lucene - Java
Issue Type: New Feature
Reporter: Robert Muir
Fix For: 4.0
Attachments: LUCENE-3423.patch
spinoff from LUCENE-3290, where yonik mentioned:
{noformat}
Is there currently a way to get the number of documents that have a value in
the field?
Then one could compute the average length of a (sparse) field via
sumTotalTermFreq(field)/docsWithField(field)
docsWithField(field) would be useful in other contexts that want to know how
sparse a field is (automatically selecting faceting algorithms, etc).
{noformat}
I think this is a useful stat to add, in case you have sparse fields for
heuristics or scoring.
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