Brandon Sloane created DAFFODIL-2043:
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Summary: fn:round-half-to-even returns decimal string
Key: DAFFODIL-2043
URL: https://issues.apache.org/jira/browse/DAFFODIL-2043
Project: Daffodil
Issue Type: Bug
Reporter: Brandon Sloane
Attachments: test.dfdl.xsd
fn:round-half-to-even() appears to be returning a decimal string, which causes
issues when an integer type is expected.
The following elements both trigger a schema definition error
<xs:element name="a" type="xs:int"
dfdl:inputValueCalc="\{ (fn:round-half-to-even( 0.1 )) }"
/>
<xs:element name="a" type="xs:int"
dfdl:inputValueCalc="\{ xs:int(fn:round-half-to-even( 0.1 )) }"
/>
[error] Schema Definition Error: Cannot convert '0.0' from String type to Long
(Cannot convert to type long: For input string: "0.0").
In contrast, casting to a double, as below, appears to work as expected:
<xs:element name="a" type="xs:int"
dfdl:inputValueCalc="\{ xs:double(fn:round-half-to-even( 0.1 )) }"
/>
What appears to be happening is that fn:round-half-to-even( 0.1 ) returns the
string "0.0", and the type="xs:int" on the element triggers an implicit cast to
an integer type. Since "0.0" contains a decimal point, this cast fail. However,
an explict cast to xs:double can succeed, and then the explicit cast to an int
from the double works as expected.
Complete example schema attached
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