Re: [Bigdata-developers] inconsistent results

[Bryan T. <br...@sy...>]

Ryan,

Turn on the solutions trace in your log4j.properties.  This will show you
the solutions flowing out of each operator. You can look at this to see
where the duplicate solutions are coming from.  Please let me know what you
find.  Is it possible that you have a quads mode database and two copies of
the data? This would then turn into a default graph query, but that should
be the RDF merge of the named graphs and so it should also be distinct.
The Explain of the query might also provide some insight.

##
# Solutions trace (tab delimited file).  Uncomment the next line to enable.
#log4j.logger.com.bigdata.bop.engine.SolutionsLog=INFO,solutionsLog
log4j.additivity.com.bigdata.bop.engine.SolutionsLog=false
log4j.appender.solutionsLog=org.apache.log4j.ConsoleAppender
#log4j.appender.solutionsLog=org.apache.log4j.FileAppender
log4j.appender.solutionsLog.Threshold=ALL
#log4j.appender.solutionsLog.File=solutions.csv
#log4j.appender.solutionsLog.Append=true
# I find that it is nicer to have this unbuffered since you can see what
# is going on and to make sure that I have complete rule evaluation logs
# on shutdown.
#log4j.appender.solutionsLog.BufferedIO=false
log4j.appender.solutionsLog.layout=org.apache.log4j.PatternLayout
log4j.appender.solutionsLog.layout.ConversionPattern=SOLUTION:\t%m

Bryan


----
Bryan Thompson
Chief Scientist & Founder
SYSTAP, LLC
4501 Tower Road
Greensboro, NC 27410
br...@sy...
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http://blog.bigdata.com <http://bigdata.com>
http://mapgraph.io

Blazegraph™ <http://www.blazegraph.com/> is our ultra high-performance
graph database that supports both RDF/SPARQL and Tinkerpop/Blueprints
APIs.  MapGraph™ <http://www.systap.com/mapgraph> is our disruptive new
technology to use GPUs to accelerate data-parallel graph analytics.

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On Mon, Jun 22, 2015 at 8:51 AM, ryan <ry...@os...> wrote:

>  Hi List,
>
> When I load the attached TTL into a blank blazegraph instance (1.5.1), I
> get different results for these two queries (they differ only in the
> "DISTINCT" keyword):
>
>
>
> SELECT DISTINCT ?People WHERE {
> ?People a <http://semoss.org/ontologies/Person>
> <http://semoss.org/ontologies/Person> .
> }
>
> SELECT ?People WHERE {
> ?People a <http://semoss.org/ontologies/Person>
> <http://semoss.org/ontologies/Person> .
> }
>
>
>
> The first query gives three results; the second gives six. All the Persons
> in the query are unique, so I expect both queries to return identical
> results.
>
>
>
> Puzzling addition: when I add a second clause to the DISTINCT query, I get
> the expected results.
>
>
>
> SELECT DISTINCT ?People WHERE {
>
> ?People a <http://semoss.org/ontologies/Person> .
>
> ?People ?p ?o .
>
> }
>
>
>
> I can come up with no explanation for this problem. I'd welcome any
> insights.
>
>
>
> Thanks,
>
>
>
> ry
>
>
>
> --
>
> I would never want to leave this country
>
> Where roads are fast and knowledge easy
>
> --Kitchens of Distinction
>
>
>
>
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