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https://issues.apache.org/jira/browse/RYA-165?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15526522#comment-15526522
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ASF GitHub Bot commented on RYA-165:
------------------------------------
Github user asfgit closed the pull request at:
https://github.com/apache/incubator-rya/pull/90
> Fluo PCJ maintenance should use ColumnVisibility.flatten() to simplify the
> visibility expression
> ------------------------------------------------------------------------------------------------
>
> Key: RYA-165
> URL: https://issues.apache.org/jira/browse/RYA-165
> Project: Rya
> Issue Type: Bug
> Components: dao
> Reporter: Puja Valiyil
> Assignee: Kevin Chilton
> Priority: Critical
>
> The Fluo application that maintains PCJ indices currently creates complex
> visibility expressions that grow with every join that is part of the SPARQL
> query.
> For example, if you create a PCJ for the following SPARQL:
> {code}
> SELECT ?customer ?worker ?city {
> ?customer <urn:talksTo> ?worker.
> ?worker <urn:livesIn> ?city.
> ?worker <urn:worksAt> <urn:BurgerJoint>.
> }
> {code}
> And you insert the following Statements:
> {code}
> Statement: "<urn:Alice> <urn:talksTo> <urn:Bob>" Visibility: "u"
> Statement: "<urn:Bob> <urn:livesIn> <urn:Happyville>" Visibility: "u"
> Statement: "<urn:Bob> <urn:worksAt> <urn:BurgerJoin>" Visibility: "u"
> {code}
> Then the following result will be exported to the PCJ index:
> {code}
> BindingSet: {{"customer", "urn:Alice"}, {"worker","urn:Bob"}, {"city",
> "urn:Happyville"} Visibility: "(u&u)&u"
> {code}
> That visibility expression could also be represented as just "u".
> ColumnVisibility.flatten() calls may be used to iteratively simplify the
> logical expression, so update the Fluo application to do so before exporting
> the result.
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