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https://issues.apache.org/jira/browse/JENA-1943?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andy Seaborne resolved JENA-1943.
---------------------------------
Fix Version/s: Jena 3.17.0
Resolution: Fixed
> Increase Precision of Decimal Calculation Results
> -------------------------------------------------
>
> Key: JENA-1943
> URL: https://issues.apache.org/jira/browse/JENA-1943
> Project: Apache Jena
> Issue Type: Bug
> Components: ARQ
> Affects Versions: Jena 3.14.0, Jena 3.16.0
> Reporter: Jan Martin Keil
> Assignee: Andy Seaborne
> Priority: Major
> Fix For: Jena 3.17.0
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> The precision of calculation results with type {{xsd:decimal}} is limited
> without need.
> An Example:
> {code:java}
> import org.apache.jena.query.QueryExecutionFactory;
> import org.apache.jena.rdf.model.ModelFactory;
> import org.junit.jupiter.api.Test;
> public class MaxDecimalDivissionPrecissionTest {
> @Test
> public void maxDecimalDivissionPrecission() {
> String query = "PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
> "//
> + "SELECT"//
> + " (
> STR(1/STRDT(\"1000000000000000000000000\", xsd:decimal)) AS ?times10)"//
> + " (
> STR(1/STRDT(\"10000000000000000000000000\", xsd:decimal)) AS ?calculated)"//
> + "
> (DATATYPE(1/STRDT(\"10000000000000000000000000\", xsd:decimal)) AS ?type)"//
> + " ( STR(
> STRDT(\"0.0000000000000000000000001\", xsd:decimal)) AS ?direct)"//
> + " (
> STR(1/STRDT(\"0.0000000000000000000000000000000000000000000001\",
> xsd:decimal)) AS ?large)"//
> + "WHERE {}";
> System.out.println(QueryExecutionFactory.create(query,
> ModelFactory.createDefaultModel()).execSelect().next().toString().replace("
> (", "\n("));
> }
> }
> {code}
> Output:
> {code:java}
> ( ?times10 = "0.000000000000000000000001" )
> ( ?direct = "0.0000000000000000000000001" )
> ( ?calculated = "0.0" )
> ( ?large = "10000000000000000000000000000000000000000000000.0" )
> ( ?type = xsd:decimal )
> {code}
>
> I would expect {{?calculated == ?direct}}. This only affects very small
> numbers, very large numbers are not affected. I also checked
> [Wikibase|https://query.wikidata.org/#PREFIX%20xsd%3A%20%3Chttp%3A%2F%2Fwww.w3.org%2F2001%2FXMLSchema%23%3E%20%0ASELECT%0A%20%20%28STR%281%2FSTRDT%28%221000000000000000000000000%22%2C%20xsd%3Adecimal%29%29%20AS%20%3Ftimes10%29%0A%20%20%28STR%281%2FSTRDT%28%2210000000000000000000000000%22%2C%20xsd%3Adecimal%29%29%20AS%20%3Fcalculated%29%0A%20%20%28STR%28%20%20STRDT%28%220.0000000000000000000000001%22%2C%20xsd%3Adecimal%29%29%20AS%20%3Fdirect%29%0A%20%20%28DATATYPE%28STRDT%28%220.0000000000000000000000001%22%2C%20xsd%3Adecimal%29%29%20AS%20%3Ftype%29%0A%20%20%28STR%281%2FSTRDT%28%220.0000000000000000000000000000000000000000000001%22%2C%20xsd%3Adecimal%29%29%20AS%20%3Flarge%29%0AWHERE%20%7B%7D]
> and RDF4J and did not find this limitation. Please consider to remove this
> limitation as I need higher precision in a view cases in a project.
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