From 869a66c429eb188ceafcbd972b6e46b63fce88f3 Mon Sep 17 00:00:00 2001 From: Peter Eisentraut Date: Thu, 23 Nov 2023 10:37:21 +0100 Subject: [PATCH v2] Check collation when creating partitioned index When creating a partitioned index, the partition key must be a subset of the index's columns. But this currently doesn't check that the collations between the partition key and the index definition match. So you can construct a unique index that fails to enforce uniqueness. (This would most likely involve a nondeterministic collation, so it would have to be crafted explicitly and is not something that would just happen by accident.) This patch adds the required collation check. As a result, any previously allowed unique index that has a collation mismatch would no longer be allowed to be created. Discussion: https://www.postgresql.org/message-id/flat/3327cb54-f7f1-413b-8fdb-7a9dceebb938%40eisentraut.org --- src/backend/commands/indexcmds.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/src/backend/commands/indexcmds.c b/src/backend/commands/indexcmds.c index 0b3b8e98b8..c7ecedbe3b 100644 --- a/src/backend/commands/indexcmds.c +++ b/src/backend/commands/indexcmds.c @@ -1011,10 +1011,13 @@ DefineIndex(Oid tableId, { if (key->partattrs[i] == indexInfo->ii_IndexAttrNumbers[j]) { - /* Matched the column, now what about the equality op? */ + /* Matched the column, now what about the collation and equality op? */ Oid idx_opfamily; Oid idx_opcintype; + if (key->partcollation[i] != collationIds[j]) + continue; + if (get_opclass_opfamily_and_input_type(opclassIds[j], &idx_opfamily, &idx_opcintype)) -- 2.42.1