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: https://postgr.es/m/OS0PR01MB6113338C102BEE8B2FFC5BD9FB619@OS0PR01MB6113.jpnprd01.prod.outlook.com
Backpatch-through: 10
Branch
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REL_10_STABLE
Details
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https://git.postgresql.org/pg/commitdiff/817c469c2a167518a7cb44a84c996c7d11a728e4
Modified Files
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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(-)