Rick created JENA-1468:
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Summary: Empty VALUES clauses lose variable bindings when compiled
to a SSE
Key: JENA-1468
URL: https://issues.apache.org/jira/browse/JENA-1468
Project: Apache Jena
Issue Type:
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https://issues.apache.org/jira/browse/JENA-1468?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rick updated JENA-1468:
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Description:
Given a SPARQL query like this:
SELECT ?foo WHERE {
?foo ?bar ?baz . # Not essential for problem just
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https://issues.apache.org/jira/browse/JENA-1468?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rick updated JENA-1468:
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Description:
Given a SPARQL query like this:
SELECT ?foo WHERE {
?foo ?bar ?baz . # Not essential for problem just
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https://issues.apache.org/jira/browse/JENA-1468?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rick updated JENA-1468:
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Description:
Given a SPARQL query like this:
SELECT ?foo WHERE {
?foo ?bar ?baz . # Not essential for problem just
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https://issues.apache.org/jira/browse/JENA-1468?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16332274#comment-16332274
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Andy Seaborne commented on JENA-1468:
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Hi Rick,
The empty table evaluates to no rows.
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Andy Seaborne edited comment on JENA-1468 at 1/19/18 3:11 PM:
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Rick commented on JENA-1468:
Hi Andy,
Thanks for your response.
I should've perhaps been clea
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Rick edited comment on JENA-1468 at 1/19/18 7:03 PM:
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Hi Andy,
Thanks
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Rick edited comment on JENA-1468 at 1/19/18 7:04 PM:
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Hi Andy,
Thanks
Hi all,
I was running riot to generate ttl files with 50+ millions triples in it in a
production machine and it took over the entire cpu resources of that box,
basically taking down the entire machine. Is there a way to limit
parallelization that it leverages and/or cpu (and memory usage) and a
Can you please tell us a bit about the machine? How many CPUs does it have /
how many cores? What are you actually doing with riot? (riot can't generate
RDF. It only translates it, so what are the original files from which you are
working.)
NTriples is almost always the least resource-intensive
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Andy Seaborne edited comment on JENA-1468 at 1/19/18 9:19 PM:
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Andy Seaborne commented on JENA-1468:
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And there was I wondering/hoping you were readin
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Rick commented on JENA-1468:
Hi Andy,
Thanks for your comments, they're enlightening, but I th
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Andy Seaborne edited comment on JENA-1468 at 1/20/18 12:02 AM:
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Parsing is single-threaded - if Java is taking over multiple CPU cores,
it could be because it is short of RAM and the parallel garbage
collector is cutting in. Increasing RAM, even by small amounts, usually
fixes this.
In addition, TTL, the pretty form is computationally expensive, as well
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