Apache Fan created OPENJPA-2553:
-----------------------------------
Summary: JPQL AVG returns Int instead of Double wrt.
@ElementCollection
Key: OPENJPA-2553
URL: https://issues.apache.org/jira/browse/OPENJPA-2553
Project: OpenJPA
Issue Type: Bug
Components: query
Affects Versions: 2.4.0
Environment: Apache Tomee plus 1.7.1,
openjpa-2.4.0-nonfinal-1598334.jar, hsqldb-2.3.2, H2DB-2014-12-19
Reporter: Apache Fan
The following JPQL query is executed to get the average of values stored in a
Map.
{noformat}
@NamedQueries({
@NamedQuery(name = "selectFromMap",
query = "SELECT new dao.entity.AggregationResultHolder(AVG(p), KEY(p))
FROM Evaluation e, IN (e.scores) p "
+ "WHERE e.subject.id=:subjectId GROUP BY KEY(p)")
})
{noformat}
Entity:
{noformat}
public class Evaluation {
...
@ElementCollection
@MapKeyColumn(name = "criteria_id")
@Column(name = "criteria_score")
private Map<Criteria, Integer> scores = new HashMap<Criteria, Integer>();
...
}
{noformat}
- *Expected behaviour:* the AVG value is returned as Double (according to
http://openjpa.apache.org/builds/2.3.0/apache-openjpa/docs/jpa_langref.html#jpa_langref_aggregates
)
- *Experienced behaviour:* the average is returned as Integer (and exception is
thrown if the AggregationResultHolder class' constructor is not Integer-based).
Unfortunately this way the fraction digits are lost.
*Workaround:* after modifying the Map to <Criteria, Double> in the entity, the
query returns Doubles for the average (however the fraction digits are still
lost in case of HSQLDB). Obviously it is a sub-optimal solution, as the schema
has to be changed.
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