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From "Rick Hillegas (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-3069) Derby does not resolve functions bound to methods with varargs.
Date Fri, 28 Sep 2007 21:12:51 GMT

    [ https://issues.apache.org/jira/browse/DERBY-3069?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12531168
] 

Rick Hillegas commented on DERBY-3069:
--------------------------------------

Let's figure out what a functional spec for this would look like. I think that we have to
start out assuming that Derby implements the relevant rules in Section 8.6. Given that, I
think that a functional spec would consist of describing the delta from those rules needed
to support varargs. Does that sound useful and adequate to you?

In describing a delta, I think that the crucial terms in 8.6 are JPDL and JCS. JPDL is the
Java Parameter Datatype List, determined by applying earlier rules to the SQL datatypes of
the routine invocation. JCS is the set of candidate methods which the rules consider as possible
resolutions of the routine invocation. At the end of the process, there should be exactly
1 method in JCS. I do not believe that varargs change the definition of JPDL. However, I believe
that varargs can add more candidate methods to JCS. So I believe it is that delta to JCS which
must be described. Again, does that sound correct to you?

It is easy for me to get lost in section 8.6. However, I think that the relevant part of that
section is Rule 3, case b, step 4, case 1. I think that is the subsection which describes
how to construct JCS for Derby's SQL invoked routines. Do you agree?

> 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
>            Assignee: Rick Hillegas
>         Attachments: derby-3069-01-varargs-aa.diff, derby-3069-01-varargs-ab.diff, 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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