You are viewing a plain text version of this content. The canonical link for it is here.
Posted to dev@jena.apache.org by "Andy Seaborne (Jira)" <ji...@apache.org> on 2019/09/13 17:37:00 UTC
[jira] [Commented] (JENA-1402) Subtracting two xsd:Duration gives
incorrect results in SPARQL query
[ https://issues.apache.org/jira/browse/JENA-1402?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16929385#comment-16929385 ]
Andy Seaborne commented on JENA-1402:
-------------------------------------
I have looked using java.time but durations are only of the day-time form, not year-month nor general.
As these are incompatible value spaces, we could use javax.xml Duration for one and java.time.Duration for the other.
Nearby: I don't see any direct xsd:g* (Gregorian year/month/day/yearMonth/dayTime) support either.
> Subtracting two xsd:Duration gives incorrect results in SPARQL query
> --------------------------------------------------------------------
>
> Key: JENA-1402
> URL: https://issues.apache.org/jira/browse/JENA-1402
> Project: Apache Jena
> Issue Type: Bug
> Components: ARQ
> Affects Versions: Jena 3.4.0
> Reporter: Greg Albiston
> Priority: Major
>
> There is an issue when subtracting two xsd:durations that include:
> * decimal seconds
> * non-zero minutes
> * second operand has a greater number of seconds than the first operand, i.e. the minutes are reduced.
> The result is a large number of minutes and incorrect seconds.
> For example:
> Integer, Larger: "PT2M3S" - "PT1M10S" = "PT0M53S" CORRECT
> Decimal, Smaller: "PT2M3.123S" - "PT1M1.123S" = "PT1M2.000S" CORRECT
> Decimal, Larger, Seconds: "PT0M3.123S" - "PT1M10.123S" = "-PT1M7.000S" CORRECT
> Decimal, Larger, Minutes: "PT2M3.123S" - "PT1M10.123S" = "PT883M0.020S" INCORRECT
> Decimal, Larger, Hours: "PT1H4M3.123S" - "PT0M10.123S" = "PT1H3883M0.020S" INCORRECT
> Example SPARQL:
> {code:sparql}
> SELECT ?res ?op1 ?op2
> WHERE{
> VALUES (?op1 ?op2) {
> ("PT2M3S"^^<http://www.w3.org/2001/XMLSchema#duration> "PT1M10S"^^<http://www.w3.org/2001/XMLSchema#duration>)
> ("PT2M3.123S"^^<http://www.w3.org/2001/XMLSchema#duration> "PT1M1.123S"^^<http://www.w3.org/2001/XMLSchema#duration>)
> ("PT0M3.123S"^^<http://www.w3.org/2001/XMLSchema#duration> "PT1M10.123S"^^<http://www.w3.org/2001/XMLSchema#duration>)
> ("PT2M3.123S"^^<http://www.w3.org/2001/XMLSchema#duration> "PT1M10.123S"^^<http://www.w3.org/2001/XMLSchema#duration>)
> ("PT1H4M3.123S"^^<http://www.w3.org/2001/XMLSchema#duration> "PT0M10.123S"^^<http://www.w3.org/2001/XMLSchema#duration>)
> }
> BIND(?op1 - ?op2 AS ?res)
> }
> {code}
--
This message was sent by Atlassian Jira
(v8.3.2#803003)