Re: ADD CONSTRAINT UNIQUE patch

Patch applied.  Thanks.

> Hi all,
>
> Here is my much-promised patch to let people add UNIQUE constraints after
> table creation time.  Big deal you say - but this patch is the basis of the
> next thing which is adding PRIMARY KEYs after table creation time.  (Which
> is currently impossible without twiddling catalogs)
>
> Rundown
> -------
>
> * I have made the makeObjectName function of analyze.c non-static, and
> exported it in analyze.h
>
> * I have included analyze.h and defrem.h into command.c, to support
> makingObjectNames and creating indices
>
> * I removed the 'case CONSTR_PRIMARY' clause so that it properly fails and
> says you can't add primary keys, rather than just doing nothing and
> reporting nothing!!!
>
> * I have modified the docs.
>
> Algorithm
> ---------
>
> * If name specified is null, search for a new valid constraint name.  I'm
> not sure if I should "lock" my generated name somehow tho - should I open
> the relation before doing this step?
>
> * Open relation in access exclusive mode
>
> * Check that the constraint does not already exist
>
> * Define the new index
>
> * Warn if they're doubling up on an existing index
>
> Chris

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