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https://issues.apache.org/jira/browse/RYA-261?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Caleb Meier updated RYA-261:
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Description:
When ParallelEvaluationStrategyImpl evaluates StatementPatterns, it doesn't
take into account the possibility that context can be specified by the
BindingSet parameter passed into its evaluate method. The evaluate method
scans Rya by building an Accumulo Range using all values relevant to the
Accumulo Row that are included in the StatementPattern and BindingSet. However,
it does not utilize context when building it Range object because context is
stored in the Accumulo Column Family. The results of this scan are effectively
(Statement, BindingSet) pairs that are joined to form a result BindingSet.
This join process does not take into account the fact that the BindingSet could
contain a value for the context that is not the same as the context value in
the Statement. As an example of this incorrect behavior, consider the
following named graph query:
select ?c ?x where{ graph ?c { ?x <uri:talksTo> <uri:Bob>; <uri:worksAt>
<uri:GroceryStore> }}
If the data (uri:Joe, uri:talksTo, uri:Bob, uri:context1), (uri:Joe,
uri:worksAt, uri:GroceryStore, uri:context2) is stored in Rya, the above query
will incorrectly return [?x = uri:Joe, ?c = context1] when it should return no
results.
was:
When ParallelEvaluationStrategyImpl evaluates StatementPatterns, it doesn't
take into account the possibility that context can be specified by the
BindingSet parameter passed into its evaluate method. The evaluate method
scans Rya by building an Accumulo Range using all values relevant to the
Accumulo Row that are included in the StatementPattern and BindingSet. However,
it does not utilize context when building it Range object because context is
stored in the Accumulo Column Family. The results of this scan are effectively
(Statement, BindingSet) pairs that are joined to form a result BindingSet.
This join process does not take into account the fact that the BindingSet could
contain a value for the context that is not the same as the context value in
the Statement. The context for the Statement is extracted and written to the
BindingSet, possibly overwriting any value of context that was there. Such
behavior occurs when one queries for the named graph of Rya statements
select ?c ?x where{ graph ?c { ?x <uri:talksTo> <uri:Bob>; <uri:worksAt>
<uri:GroceryStore> }}
If the data (uri:Joe, uri:talksTo, uri:Bob, uri:context1), (uri:Joe,
uri:worksAt, uri:GroceryStore, uri:context2) is stored in Rya the above query
will incorrectly return [?x = uri:Joe, ?c = context2] when it should return no
results.
> Context Validation for StatementPattern Evaluation
> --------------------------------------------------
>
> Key: RYA-261
> URL: https://issues.apache.org/jira/browse/RYA-261
> Project: Rya
> Issue Type: Bug
> Components: clients, dao
> Affects Versions: 3.2.10
> Reporter: Caleb Meier
> Assignee: Caleb Meier
> Fix For: 3.2.10
>
>
> When ParallelEvaluationStrategyImpl evaluates StatementPatterns, it doesn't
> take into account the possibility that context can be specified by the
> BindingSet parameter passed into its evaluate method. The evaluate method
> scans Rya by building an Accumulo Range using all values relevant to the
> Accumulo Row that are included in the StatementPattern and BindingSet.
> However, it does not utilize context when building it Range object because
> context is stored in the Accumulo Column Family. The results of this scan
> are effectively (Statement, BindingSet) pairs that are joined to form a
> result BindingSet. This join process does not take into account the fact
> that the BindingSet could contain a value for the context that is not the
> same as the context value in the Statement. As an example of this incorrect
> behavior, consider the following named graph query:
> select ?c ?x where{ graph ?c { ?x <uri:talksTo> <uri:Bob>; <uri:worksAt>
> <uri:GroceryStore> }}
> If the data (uri:Joe, uri:talksTo, uri:Bob, uri:context1), (uri:Joe,
> uri:worksAt, uri:GroceryStore, uri:context2) is stored in Rya, the above
> query will incorrectly return [?x = uri:Joe, ?c = context1] when it should
> return no results.
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