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https://issues.apache.org/jira/browse/DERBY-3119?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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James F. Adams updated DERBY-3119:
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Attachment: derby-3119-1_diff.txt
Attached is a patch proposal that I believe corrects the problem.
The resolveMethodCall method of MethodCallNode has been modified to properly
validate return types SMALLINT, INTEGER, BIGINT, REAL, and DOUBLE. These types
are object mappable to Integer, Integer, Long, Float, and Double as well as
simply mappable to short, int, long, float, and double.
In addition I added tests to RoutineTest.
Ran Derbyall and suites.All with no new errors.
> Derby does not resolve functions to methods with Integer return type.
> ---------------------------------------------------------------------
>
> Key: DERBY-3119
> URL: https://issues.apache.org/jira/browse/DERBY-3119
> Project: Derby
> Issue Type: Bug
> Components: SQL
> Affects Versions: 10.1.1.0, 10.1.2.1, 10.1.3.1, 10.2.1.6, 10.2.2.0,
> 10.3.1.4
> Reporter: Rick Hillegas
> Assignee: James F. Adams
> Attachments: derby-3119-1_diff.txt
>
>
> Derby can bind a function invocation to a method which returns int but not to
> a method which returns Integer. I think that both of these resolutions should
> succeed given the rules in the SQL Standard, part 13, section 8.6, syntax
> rule 5, case a, item ii. Here is some code which shows this problem. First a
> class to declare the methods:
> public class zz
> {
> public static int returnsInt()
> {
> return 1;
> }
>
> public static Integer returnsInteger()
> {
> return new Integer( 2 );
> }
>
> }
> The following ij script shows that the int-returning method is resolved but
> not the Integer-returning method:
> ij version 10.4
> ij> connect 'jdbc:derby:derby10.4;create=true';
> WARNING 01J01: Database 'derby10.4' not created, connection made to existing
> database instead.
> ij> drop function returnsInt;
> 0 rows inserted/updated/deleted
> ij> drop function returnsInteger;
> 0 rows inserted/updated/deleted
> ij> create function returnsInt()
> returns int
> language java
> parameter style java
> no sql
> external name 'zz.returnsInt'
> ;
> 0 rows inserted/updated/deleted
> ij> create function returnsInteger()
> returns int
> language java
> parameter style java
> no sql
> external name 'zz.returnsInteger'
> ;
> 0 rows inserted/updated/deleted
> ij> values ( returnsInt() );
> 1
> -----------
> 1
> 1 row selected
> ij> values ( returnsInteger() );
> ERROR 42X50: No method was found that matched the method call int
> zz.returnsInteger(), tried all combinations of object and primitive types and
> any possible type conversion for any parameters the method call may have.
> The method might exist but it is not public and/or static, or the parameter
> types are not method invocation convertible.
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