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From "Rick Hillegas (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-4469) Fix the CASTing behavior of UDTs
Date Sat, 12 Dec 2009 20:43:18 GMT

     [ https://issues.apache.org/jira/browse/DERBY-4469?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Rick Hillegas updated DERBY-4469:
---------------------------------

    Attachment: derby-4469-01-aa-castNullsAndUntypedParameters.diff

Attaching derby-4469-01-aa-castNullsAndUntypedParameters.diff. This patch makes it possible
to cast nulls and untyped ? parameters as UDTs. More tests will need to be written to verify
that casting from builtin types to UDTs and vice-versa does not work. Some additional logic
will need to be written to handle the case when a UDT is bound to one of the Java types which
correspond to Derby's SQL types (e.g., String, Integer, etc.). Tests passed cleanly for me.
Committed at subversion revision 889975.

Touches the following files:

M      java/engine/org/apache/derby/impl/sql/compile/sqlgrammar.jj
M      java/engine/org/apache/derby/impl/sql/compile/CastNode.java

Allow casting to UDTs.

M      java/testing/org/apache/derbyTesting/functionTests/tests/lang/UDTTest.java

Verify that the following now work:

  cast ( null as udtType )
  cast ( ? as udtType )

In addition, change the definition of the UDT dependent views so that they reference UDTs
via casts rather than via function calls. This will tease apart the next bit of dependency
tracking which must be built: dependencies of routines on UDTs.


M      java/testing/org/apache/derbyTesting/functionTests/master/db2Compatibility.out

The casts to Java types now fail with a different syntax error.


> Fix the CASTing behavior of UDTs
> --------------------------------
>
>                 Key: DERBY-4469
>                 URL: https://issues.apache.org/jira/browse/DERBY-4469
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 10.6.0.0
>            Reporter: Rick Hillegas
>            Assignee: Rick Hillegas
>         Attachments: derby-4469-01-aa-castNullsAndUntypedParameters.diff
>
>
> The actual behavior of UDTs, now under construction, does not conform to the spec. The
spec says that you can't CAST to or from UDTs. This is probably too harsh. We should allow
the following CAST
>   cast ( null as udtType )
> I also think that we should allow at least the implicit casting of subtypes to supertypes
since Java gives us the ability to discover the type graph. See Knut's comment on DERBY-651
on Dec 11, 2009.

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