Thanks for the quick response.
+ if (mapped_partkey_attnums[i] == pk_attnums[j])
+ {
+ partkey_vals[i] = pk_vals[j];
+ partkey_isnull[i] = pk_nulls[j] == 'n' ? true : false;
+ i++;
+ break;
The way counter (i) is incremented is out of my expectation.
In the rare case, where some i doesn't have corresponding pk_attnums[j], wouldn't there be a dead loop ?
I think the goal of adding the assertion should be not loop infinitely even if the invariant is not satisfied.
I guess a counter other than i would be better for this purpose.
Cheers
On Tue, Jan 19, 2021 at 2:47 AM Zhihong Yu <zyu@yugabyte.com> wrote:
>
> Hi,
> I was looking at this statement:
>
> insert into f select generate_series(1, 2000000, 2);
>
> Since certain generated values (the second half) are not in table p, wouldn't insertion for those values fail ?
> I tried a scaled down version (1000th) of your example:
>
> yugabyte=# insert into f select generate_series(1, 2000, 2);
> ERROR: insert or update on table "f" violates foreign key constraint "f_a_fkey"
> DETAIL: Key (a)=(1001) is not present in table "p".
Sorry, a wrong copy-paste by me. Try this:
create table p (a numeric primary key);
insert into p select generate_series(1, 2000000);
create table f (a bigint references p);
-- Unpatched
insert into f select generate_series(1, 2000000, 2);
INSERT 0 1000000
Time: 6527.652 ms (00:06.528)
update f set a = a + 1;
UPDATE 1000000
Time: 8108.310 ms (00:08.108)
-- Patched:
insert into f select generate_series(1, 2000000, 2);
INSERT 0 1000000
Time: 3312.193 ms (00:03.312)
update f set a = a + 1;
UPDATE 1000000
Time: 4292.807 ms (00:04.293)
> For v1-0002-Avoid-using-SPI-for-some-RI-checks.patch :
>
> + * Collect partition key values from the unique key.
>
> At the end of the nested loop, should there be an assertion that partkey->partnatts partition key values have been found ?
> This can be done by using a counter (initialized to 0) which is incremented when a match is found by the inner loop.
I've updated the patch to add the Assert. Thanks for taking a look.
--
Amit Langote
EDB: http://www.enterprisedb.com
