angela created OAK-6304:
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             Summary: Cyclic dependency between oak.spi.query an oak.query.*
                 Key: OAK-6304
                 URL: https://issues.apache.org/jira/browse/OAK-6304
             Project: Jackrabbit Oak
          Issue Type: Task
          Components: core, indexing, query
            Reporter: angela


while working on OAK-6069 i noticed that there exist IMO troublesome 
dependencies from _o.a.j.oak.spi.query_ back to _o.a.j.oak.query.*_. While i 
don't know the historical reasons that led to this setup it feels wrong to me 
that the interfaces and classes in _o.a.j.oak.spi.query_ would have 
dependencies to packages that from my understanding are supposed to contain 
implementations.

while utilities like {{o.a.j.oak.spi.query.Cursors}} may simply have ended up 
in the wrong bucket and could possibly moved to e.g _o.a.j.query.index_, i 
couldn't find an easy solution for an interface like  
{{o.a.j.oak.spi.query.Filter}} that defines methods returning 
{{o.a.j.query.fulltext.FullTextExpression}} and 
{{o.a.j.query.QueryEngineSettings}}, while at the same time being tied to the 
{{o.a.j.oak.spi.query.QueryIndex}} interface.



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