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https://issues.apache.org/jira/browse/DERBY-3069?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12526879
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Rick Hillegas commented on DERBY-3069:
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Thanks for the reference to The Java Language Specification, Second Edition
late in Part 13, Section 8.6. That section seems to indicate that the Java
method resolution rules are to be applied to isolate a set of candidate methods
after the types of the arguments have been mapped from SQL types to Java types.
The sentence in section 4.2.2 which leapt out at me was this: "If the instance
SQL-invoked method is an external Java routine, the term "set of overriding
methods" is not applicable; for such methods, the capabilities provided by
overriding methods duplicate Java's own mechanisms and the subject routine
executed is the one that would be invoked when no overriding methods are
specified."
The CREATE FUNCTION section is vague about how Derby will resolve methods at
run-time. Where is this documented?
The varargs information must be propagated to the classfile. It can be
retrieved via reflection by calling Method.isVarArgs().
> Derby does not resolve functions bound to methods with varargs.
> ---------------------------------------------------------------
>
> Key: DERBY-3069
> URL: https://issues.apache.org/jira/browse/DERBY-3069
> Project: Derby
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 10.0.2.0, 10.0.2.1, 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
> Attachments: z.java, z.sql
>
>
> Varargs were added in Java 5. It would be nice if Derby let you invoke a
> function bound to a method with a variable length argument list. The
> Reference Guide states a small number of restrictions for methods which can
> be invoked as Derby functions: They must be public, static, and not have
> arguments which are long datatypes. I see no reason that Derby shouldn't be
> able to resolve and invoke functions which are bound to methods which don't
> suffer these limitations but which have variable argument lists.
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