Re: json function volatility

From: Merlin Moncure <mmoncure(at)gmail(dot)com>
To: Andrew Dunstan <andrew(at)dunslane(dot)net>
Cc: PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: json function volatility
Date: 2014-10-17 20:44:09
Message-ID: CAHyXU0yat7oc-sYmjAS5jpmyNVot+7w11sed_CNjZv_b6_vH0g@mail.gmail.com
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On Fri, Oct 17, 2014 at 3:03 PM, Andrew Dunstan <andrew(at)dunslane(dot)net> wrote:
> Following up something Pavel wrote, I notice that json_agg() and
> json_object_agg() are both marked as immutable, even though they invoke IO
> functions, while json_object is marked stable, even though it does not, and
> can probably be marked as immutable. Mea maxima culpa.
>
> I'm not sure what we should do about these things now. Is it a tragedy if we
> let these escape into the 9.4 release that way?

Is it too late to change them? Either way, it seems fairly
implausible someone would come up with a case to stick json_agg(), or
any aggregate function really, inside of an index. So it's not exactly
the crime of the century.

merlin

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