On another thread [0], Alexander Lakhin pointed out, indirectly, that
partitions created using LIKE+ATTACH now have different not-null constraints
from partitions created using PARTITION OF.
postgres=# CREATE TABLE t (i int PRIMARY KEY) PARTITION BY RANGE (i);
postgres=# CREATE TABLE t1 PARTITION OF t DEFAULT ;
postgres=# \d+ t1
...
Partition of: t DEFAULT
No partition constraint
Indexes:
"t1_pkey" PRIMARY KEY, btree (i)
Access method: heap
But if it's created with LIKE:
postgres=# CREATE TABLE t1 (LIKE t);
postgres=# ALTER TABLE t ATTACH PARTITION t1 DEFAULT ;
..one also sees:
Not-null constraints:
"t1_i_not_null" NOT NULL "i"
It looks like ATTACH may have an issue with constraints implied by pkey.
[0] https://www.postgresql.org/message-id/8034d1c6-5f0e-e858-9af9-45d5e246515e%40gmail.com
--
Justin