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From "Rajesh Kartha (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-1490) Provide ALTER TABLE RENAME COLUMN functionality
Date Sun, 05 Nov 2006 20:23:18 GMT
    [ http://issues.apache.org/jira/browse/DERBY-1490?page=comments#action_12447318 ] 
            
Rajesh Kartha commented on DERBY-1490:
--------------------------------------

The latest patch applied successfully.

An initial observations:

Rename column of a non-existent table throws an ' ALTER TABLE" error:

ij> create table btab (i int, j varchar(100));
0 rows inserted/updated/deleted
ij> rename column btab1.i to id;
ERROR 42Y55: 'ALTER TABLE' cannot be performed on 'BTAB1' because it does not exist.

I would expect this to be consistent to following

ij> rename table abcd to bcd;
ERROR 42Y55: 'RENAME TABLE' cannot be performed on 'ABCD' because it does not exist.

Will try out some other scenarios and provide further comments for the new patch.


Meanwhile,  I was thinking:

Like 'RENAME COLUMN" isn't  'RENAME CONSTRAINT'  a good feature to have in Derby ? 

Currently it  is a two step process:
- ALTER TABLE DROP CONSTRAINT
- ALTER TABLE  ADD CONSTRAINT

With a 'RENAME CONSTRAINT'  this can be done in a single step.

Maybe I will open a JIRA  enhancement request to track this.

-Rajesh

> Provide ALTER TABLE RENAME COLUMN functionality
> -----------------------------------------------
>
>                 Key: DERBY-1490
>                 URL: http://issues.apache.org/jira/browse/DERBY-1490
>             Project: Derby
>          Issue Type: New Feature
>          Components: Documentation, SQL
>    Affects Versions: 10.0.2.0, 10.0.2.1, 10.1.1.0, 10.2.1.6, 10.1.2.1, 10.1.3.1
>            Reporter: Bryan Pendleton
>         Assigned To: Bryan Pendleton
>         Attachments: 1490_cannot_patch.jpg, derby1490_v1_needMoreTests.diff, renameColumn_v2_with_tests.diff,
renameColumn_v3_after_review.diff
>
>
> Provide a way to rename a column in an existing table. Possible syntax could be:
>   ALTER TABLE tablename RENAME COLUMN oldcolumn TO newcolumn;
> Feature should properly handle the possibility that the column is currently used in constraints,
views, indexes, triggers, etc.

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