Re: Converting char to varchar automatically

BTW, where can I find a list of type1->type2 pairs that doesn't
require full table lock for conversion?

ps. Sorry for top posting.

On Mon, Oct 6, 2014 at 4:20 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> Melvin Davidson <melvin6925@gmail.com> writes:
>> Also, don't forget to test for relkind = 'r'. My bad from before.
>
> In principle you need to ignore attisdropped columns as well.
>
> Thinking about Jim's point about speed: it'd be wise to collapse any
> updates for multiple columns in the same table into one ALTER command,
> so that you only rewrite the table once, not once per column.
>
>                         regards, tom lane
>
>
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