Postgres 12

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Help with an interesting Postgres question: Why isn't an Index Only Scan used on a partition accessed via the parent table?.

create table DEMO (n int);
begin transaction;
insert into DEMO values (0);
1 rows affected

select n "after insert" from DEMO;

after insert

0

update DEMO set n=1/n;
ERROR:  division by zero

select n "after error" from DEMO;
ERROR:  current transaction is aborted, commands ignored until end of transaction block

commit;
select n "after commit" from DEMO;