Michael McCandless created LUCENE-7899:
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Summary: Add "exists" query for doc values
Key: LUCENE-7899
URL: https://issues.apache.org/jira/browse/LUCENE-7899
Project: Lucene - Core
Issue Type: Improvement
Reporter: Michael McCandless
Assignee: Michael McCandless
Fix For: 7.1
I don't think we have a query today to efficiently test whether a doc values
field exists (has any value) for each document in the index?
Now that we use iterators to access doc values, this should be an efficient
query: we can return the DISI we get for the doc values.
ElasticSearch indexes its own field to record which field names occur in a
document, so it's able to do "exists" for any field (not just doc values
fields), but I think doc values fields we can just get "for free".
I haven't started on this ... just wanted to open the issue first for
discussion.
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