Richard Cyganiak created JENA-1070:
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Summary: SPARQL: Cast from xsd:double to xsd:decimal fails
Key: JENA-1070
URL: https://issues.apache.org/jira/browse/JENA-1070
Project: Apache Jena
Issue Type: Bug
Reporter: Richard Cyganiak
Priority: Minor
Casting from xsd:double to xsd:decimal apparently doesn't work if the
xsd:double is in exponent notation. Example:
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
SELECT (xsd:decimal("1e0"^^xsd:double) AS ?x) WHERE {}
I tried running this on sparql.org. I expect this to return "1"^^xsd:decimal or
"1.0"^^xsd:decimal. It returns nothing.
It returns the expected xsd:decimal values when changing the lexical form from
"1e0" to "1.0" or "1", although these all represent the same legal double value.
The same problem occurs when casting to xsd:integer, or when the input is
xsd:float.
I think the correct behaviour of the xsd:decimal and xsd:integer casting
functions are specified in
http://www.w3.org/TR/xpath-functions/#casting-to-numerics, and I read them as
stating that xsd:double inputs should work.
Since pretty much any maths on xsd:double (including ROUND and FLOOR) returns
xsd:double in e notation, this issue makes it very hard to produce “pretty”
number output if the input contains xsd:doubles. It looks like one has to
resort to truncating the e0 part with string operations.
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