Re: BUG #15669: Error with unnest in PG 11 (ERROR: 0A000)

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: thibaut(dot)madelaine(at)dalibo(dot)com
Cc: pgsql-bugs(at)lists(dot)postgresql(dot)org
Subject: Re: BUG #15669: Error with unnest in PG 11 (ERROR: 0A000)
Date: 2019-03-05 15:39:07
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PG Bug reporting form <noreply(at)postgresql(dot)org> writes:
> In PostgreSQL 10.7 and before, it is possible to run the following query:

> thibaut=# WITH test AS ( SELECT array[1,2] AS intarr )
> SELECT unnest(intarr) AS lot_id FROM test WHERE false;

> In version 11.2, the same query fails:
> ERROR: 0A000: set-valued function called in context that cannot accept a set

Hmm, that's definitely a bug. It looks like we're forgetting to make
a ProjectSet plan node for the unnest() if we realize that the query
is a no-op; but I'm not sure why 10.x doesn't have the same issue.
Digging ...

regards, tom lane

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