pgsql: Block ALTER TABLE .. DROP NOT NULL on columns in replica identit

Started by Michael Paquierover 4 years ago1 messagescomitters

michael@paquier.xyz

over 4 years ago

Block ALTER TABLE .. DROP NOT NULL on columns in replica identity index

Replica identities that depend directly on an index rely on a set of
properties, one of them being that all the columns defined in this index
have to be marked as NOT NULL. There was a hole in the logic with ALTER
TABLE DROP NOT NULL, where it was possible to remove the NOT NULL
property of a column part of an index used as replica identity, so block
it to avoid problems with logical decoding down the road.

The same check was already done columns part of a primary key, so the
fix is straight-forward.

Author: Haiying Tang, Hou Zhijie
Reviewed-by: Dilip Kumar, Michael Paquier
Discussion: /messages/by-id/OS0PR01MB6113338C102BEE8B2FFC5BD9FB619@OS0PR01MB6113.jpnprd01.prod.outlook.com
Backpatch-through: 10

Branch
------
REL_14_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/e415916e24ccf28a88d87182e716beace9820753

Modified Files
--------------
src/backend/commands/tablecmds.c | 31 ++++++++++++++++++--------
src/test/regress/expected/replica_identity.out | 4 ++++
src/test/regress/sql/replica_identity.sql | 4 ++++
3 files changed, 30 insertions(+), 9 deletions(-)