Re: Multi-insert into a partitioned table with before insert row trigger causes server crash on latest HEAD

(Returns from leave and beyond the reaches of the internet)

On 18 October 2018 at 07:45, Peter Eisentraut
<peter(dot)eisentraut(at)2ndquadrant(dot)com> wrote:
> On 16/10/2018 06:33, Ashutosh Sharma wrote:
>> I think, the root cause of this problem is that CopyFrom() is using
>> the stale value of *has_before_insert_row_trig* to determine if the
>> current partition is okay for multi-insert or not i.e.
>> has_before_insert_row_trig used to determine multi-insert condition
>> for the current partition actually belongs to old partition. I think,
>> *has_before_insert_row_trig* needs to updated before CopyFrom()
>> evaluates if the current partition is good to go for multi insert or
>> not. Attached is the patch based on this. I've also added the relevant
>> test-case for it. Peter, David, Could you please have a look into the
>> attached patch and share your thoughts. Thank you.
>
> I have committed your fix and test, moving some code around a bit. Thanks.

Thanks for pushing that fix.

Originally my patch in [1] only could set leafpart_use_multi_insert to
true within the `if (insertMethod == CIM_MULTI_CONDITIONAL)` test, so
wouldn't have suffered from this problem.

I'm not sure that doubling up the `insertMethod ==
CIM_MULTI_CONDITIONAL` test is the cleanest fix. Personally, I liked
the way it was in the v6 edition of the patch, but I'm used to getting
outvoted.

[1] https://www.postgresql.org/message-id/CAKJS1f9f8yuj04X_rffNu2JPbvhy+YP_aVH6iwCTJ1OL=YwCOg@mail.gmail.com

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David Rowley http://www.2ndQuadrant.com/
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