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From: Kirill Reshke <[email protected]>
To: Tom Lane <[email protected]>
Cc: Tender Wang <[email protected]>
Cc: jian he <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: Amit Langote <[email protected]>
Subject: Re: BUG #19099: Conditional DELETE from partitioned table with non-updatable partition raises internal error
Date: Thu, 30 Oct 2025 11:44:07 +0500
Message-ID: <CALdSSPi9n2KGzKQn2Egqz3H8Nx0cgnZ8UeB5gk-KVdE3uBCj6Q@mail.gmail.com> (raw)
In-Reply-To: <CALdSSPi7udsgQg3PUG=Z4+-9pRg8wT3HkDvTgYvtg30xNWQ9OA@mail.gmail.com>
References: <[email protected]>
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	<CAHewXN=vF5d9O4R3+iUwLqEaP7pb8iYAN_e3vEE_p5sJHofn7w@mail.gmail.com>
	<[email protected]>
	<CALdSSPi7udsgQg3PUG=Z4+-9pRg8wT3HkDvTgYvtg30xNWQ9OA@mail.gmail.com>

On Thu, 30 Oct 2025 at 10:31, I wrote:
>
>  I mean, we I believe we need to execute
> CheckValidResultRel against all partitions in ExecInitModifyTable, at
> least when no partition pruning has been performed
>

So, the problem is that we managed to exclude all child relations, and
only have a single (dummy) root relation as a result of the
modifyTable plan. Maybe we should populate its target list with
pseudo-junk columns in create_modifytable_plan ?

For instance, they query does not error-out if we have at least one
another non-file-fdw partition:

create table p2 partition of pt for values in ( 2) ;

this is because we have this in create_modifytable_plan

```
/* Transfer resname/resjunk labeling, too, to keep executor happy */
apply_tlist_labeling(subplan->targetlist, root->processed_tlist);
```

and we successfully found a junk column in the p2 partition.

The problem is, it works iff root->processed_tlist has at least one
relation which can give us junk columns. Should we add handling for
corner case here?
Another option is to remove this 'Transfer resname/resjunk labeling'
completely and rework planner-executer contracts somehow.

-- 
Best regards,
Kirill Reshke

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  Subject: Re: BUG #19099: Conditional DELETE from partitioned table with non-updatable partition raises internal error
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