[jira] [Created] (OAK-7898) Facet queries with UNION should do trivial merge of facets from sub-queries

["Vikas Saurabh (JIRA)" <ji...@apache.org>]

Vikas Saurabh created OAK-7898:
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             Summary: Facet queries with UNION should do trivial merge of facets from sub-queries
                 Key: OAK-7898
                 URL: https://issues.apache.org/jira/browse/OAK-7898
             Project: Jackrabbit Oak
          Issue Type: Sub-task
          Components: lucene
            Reporter: Vikas Saurabh
            Assignee: Vikas Saurabh


Queries such as {noformat} //*[@name = 'Node1' or @text = 't2']/(rep:facet(text)) {noformat} get split into 2 sub-queries such as 
# {noformat} //*[@name = 'Node1']/(rep:facet(text)) {noformat}
# {noformat} //*[@test = 't2']/(rep:facet(text)) {noformat}

Trivially merging facets (union of labels and sum of counts for same labels) across sub-queries in generally wrong because of potential intersection rows. But, in common practical cases, intersections aren't a big majority so, albeit incorrect, trivial merge shouldn't be off huge amount. Note that usual path restrictions and node type restrictions are the most common case with {{OR}} and they do have have no intersection in almost all cases.

That said, since it's going to give incorrect result by design, we need to very explicit in our documentation.



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