Re: Reconcile stats in find_tabstat_entry() and get rid of PgStat_BackendFunctionEntry

Hi,

On 2/16/23 10:21 PM, Andres Freund wrote:
> Hi,
> 
> On 2023-02-15 09:21:48 +0100, Drouvot, Bertrand wrote:
>> diff --git a/src/backend/utils/activity/pgstat_relation.c b/src/backend/utils/activity/pgstat_relation.c
>> index f793ac1516..b26e2a5a7a 100644
>> --- a/src/backend/utils/activity/pgstat_relation.c
>> +++ b/src/backend/utils/activity/pgstat_relation.c
>> @@ -471,20 +471,46 @@ pgstat_fetch_stat_tabentry_ext(bool shared, Oid reloid)
>>    * Find any existing PgStat_TableStatus entry for rel_id in the current
>>    * database. If not found, try finding from shared tables.
>>    *
>> + * If an entry is found, copy it and increment the copy's counters with their
>> + * subtransactions counterparts. Then return the copy. There is no need for the
>> + * caller to pfree the copy as the MemoryContext will be reset soon after.
>> + *
> 
> The "There is no need" bit seems a bit off. Yes, that's true for the current
> callers, but who says that it has to stay that way?
> 

Good point. Wording has been changed in V6 attached.

> Otherwise this looks ready, on a casual scan.
> 

Thanks for having looked at it!

Regards,

-- 
Bertrand Drouvot
PostgreSQL Contributors Team
RDS Open Source Databases
Amazon Web Services: https://aws.amazon.com