From: | Martijn de Munnik <martijndemunnik(at)protonmail(dot)com> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | pgsql-general(at)postgresql(dot)org |
Subject: | Re: ERROR: only immutable functions supported in continuous aggregate view |
Date: | 2023-03-12 08:49:45 |
Message-ID: | 5a6b29d8-7223-5959-1e6e-c84468525f6f@protonmail.com |
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Lists: | pgsql-general |
Ok, now I understand, thank you.
My solution is to create materialized view with intermediate values and
the create a normal view on top that uses the intermediate values and
the jsonb_build_object function to create the desired result.
Kind regards,
Martijn de Munnik
On 2023-03-11 16:47, Tom Lane wrote:
> Martijn de Munnik <martijndemunnik(at)protonmail(dot)com> writes:
>> The error is caused by the jsonb_build_object function, is there any
>> reason why this function is not IMMUTABLE?
> It can invoke arbitrary datatype output functions, some of which are
> not immutable. We unfortunately lack any infrastructure that would
> allow reasoning that "all the types used in this specific invocation
> have immutable output functions, so it'd be OK to consider this
> invocation immutable". So we have to assume the worst when labeling
> jsonb_build_object. (Even if we had such infrastructure, I doubt
> it would save you in this use-case, because it looks like some of
> the values you're converting are timestamps, which respond to the
> DateStyle and TimeZone settings.)
>
> You could, on these grounds, argue that jsonb_build_object and other
> functions with this problem actually need to be VOLATILE. But we've
> established a project convention that I/O functions should be at
> worst STABLE, allowing calling functions to be STABLE as well.
>
> regards, tom lane
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