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https://issues.apache.org/jira/browse/JENA-814?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andy Seaborne closed JENA-814.
------------------------------
Resolution: Fixed
Fix Version/s: Jena 2.12.2
Assignee: Andy Seaborne
Special case places where Java is wrong.
Fixed in Java 9:
http://bugs.java.com/bugdatabase/view_bug.do?bug_id=5077522
> Duration comparison returning incorrect results 28D = 1M and 365D = 1Y
> ----------------------------------------------------------------------
>
> Key: JENA-814
> URL: https://issues.apache.org/jira/browse/JENA-814
> Project: Apache Jena
> Issue Type: Bug
> Components: ARQ
> Affects Versions: Fuseki 1.0.1, Fuseki 1.0.2, Fuseki 1.1.1
> Environment: OS X 10.10.1
> Reporter: Arthur Keen
> Assignee: Andy Seaborne
> Fix For: Jena 2.12.2
>
>
> When comparing equality of 28 days to 1 month and 365 days to 1 year in
> Fuseki 1.1.1 and 1.0.1, Fuseki responds that they are the same, whereas the
> answer is indeterminate.
> How to reproduce:
> {noformat}
> SELECT ("P28D"^^<http://www.w3.org/2001/XMLSchema#duration>
> ="P1M"^^<http://www.w3.org/2001/XMLSchema#duration> as ?same) {}
> --------
> | same |
> ========
> | true |
> --------
> SELECT ("P365D"^^<http://www.w3.org/2001/XMLSchema#duration>
> ="P1Y"^^<http://www.w3.org/2001/XMLSchema#duration> as ?same) {}
> --------
> | same |
> ========
> | true |
> --------
> {noformat}
> Reference:
> The following table shows the strongest relationship that can be determined
> between example durations. The symbol <> means that the order relation is
> indeterminate. Note that because of leap-seconds, a seconds field can vary
> from 59 to 60. However, because of the way that addition is defined in Adding
> durations to dateTimes, they are still totally ordered.
> {noformat}
> Relation
> P1Y > P364D <> P365D <> P366D < P367D
> P1M > P27D <> P28D <> P29D <> P30D <> P31D < P32D
> P5M > P149D <> P150D <> P151D <> P152D <> P153D < P154D
> {noformat}
> Implementations are free to optimize the computation of the ordering
> relationship. For example, the following table can be used to compare
> durations of a small number of months against days.
> However, Fuseki seem to have implemented this ordering differently.
> According to Fuseki,
> {noformat}
> P1M == P28D => true - not OK(should be indeterminate according to
> specification)
> P1M <> P29D - OK
> P1M <> P30D - OK
> P1M <> P31D - OK
> P1M < P32D - OK
> P1Y == P365D -> true - not OK (should be indeterminate according to
> specification)
> P1Y <> P366D - OK
> P1Y < 367D OK
> {noformat}
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