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Re: ALTER TABLE ... TO ... to change related names

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Andrew Dunstan <andrew(at)dunslane(dot)net>
Cc: pgsql-hackers(at)postgresql(dot)org,Jonathan Gardner <jgardner(at)jonathangardner(dot)net>
Subject: Re: ALTER TABLE ... TO ... to change related names
Date: 2003-08-30 16:38:06
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
Andrew Dunstan <andrew(at)dunslane(dot)net> writes:
> There is no guarantee that a given sequence is used only for one column 
> in one table, as I understand it. So renaming it could screw you up badly.

Yeah, I would recommend having a discussion about the details of the
proposed behavior before you start coding, not after.

It'd probably be reasonable to rename only those sequences that are
connected to the target table/column by internal dependencies --- this
indicates that they were created by a SERIAL column definition and not
by manual operations.  IIRC, pg_dump already uses this same cue to
decide whether to dump the sequence definition separately or say SERIAL.

It'd still be possible for someone's schema to break, if they made a
sequence via SERIAL and then referred to it by name in defaults for
other columns.  But I think we could say they were being unreasonably
intimate with implementation details in that case.

Similar rules need to be agreed to about when to rename indexes.

			regards, tom lane

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