Re: Patch to ALTER TABLE docs for 7.2.1

> Christopher Kings-Lynne wrote:
> Another idea.  Now that we have ALTER TABLE / ADD PRIMARY KEY - we should
> modify the pg_dump format to instead of doing this:
>
> CREATE TABLE food (
>     a int4,
>     PRIMARY KEY (a)
> );
>
> COPY FROM ...
>
> It should be like this:
>
> CREATE TABLE food (
>     a int4
> );
>
> COPY FROM ...
>
> ALTER TABLE food ADD PRIMARY KEY (a);
>
> This will be a lot faster.  The only reason (I believe) that it was not done
> like this previously is that it wasn't possible to recreate a PK in any
> other way without twiddling the catalogs.

Very good point.  Added to TODO:

    * Have pg_dump use ADD PRIMARY KEY after COPY, for performance

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