From: | Catalin Iacob <iacobcatalin(at)gmail(dot)com> |
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To: | Andrew Dunstan <andrew(at)dunslane(dot)net> |
Cc: | Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>, "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com>, Michael Paquier <michael(dot)paquier(at)gmail(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Adam Brightwell <adam(dot)brightwell(at)crunchydatasolutions(dot)com>, "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com>, dinesh kumar <dineshkumar02(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: proposal: multiple psql option -c |
Date: | 2015-11-16 16:16:25 |
Message-ID: | CAHg_5gqds7ipWwykyrMpes_4ZXjyBPLT9PtMWqKzOn5MUK-L9Q@mail.gmail.com |
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Lists: | pgsql-hackers |
On Sun, Nov 15, 2015 at 3:53 PM, Andrew Dunstan <andrew(at)dunslane(dot)net> wrote:
> I suggest you review the original thread on this subject before a line was
> ever written. "multiple" (see subject line on this whole thread) is clearly
> what is being asked for. Making people turn that into a single argument is
> not what was envisaged. See for example Pavel's original example involving
> use of xargs where that's clearly not at all easy.
I couldn't see why it would matter to have multiple -C, but xargs
having -n which consumes more than 1 stdin item is indeed an use case.
When reading the thread I didn't notice it since I didn't know what -n
does.
But multiple -C is confusing since it suggests the groupings matter.
To me at least, it feels weird that -C "SELECT 1; SELECT 2;" -C
"SELECT 3;" is the same as -C "SELECT 1; SELECT 2; SELECT 3" and lots
of other combinations. It feels like the split in groups must mean
something, otherwise why would you support/use multiple groups?
Upthread at least somebody thought each -C group would/should be a
transaction and I can see this confusion coming up again and again,
enough to question whether this patch is an improvement over the
current situation. And if a single -C is too small of an improvement,
maybe it means the whole idea should be dropped. I think the same of
multiple -f as well: to me they're more confusing than helpful for the
same reason.
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