postgres.git / summary / log / commit / refs
commit 3dfd2d6cd28a125edc4761eaefaa1193f111459d
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: Wed Mar 11 14:04:59 2020 +0000
First released in: 13.0, 9.6.18, 10.13, 11.8, 12.3
Avoid duplicates in ALTER ... DEPENDS ON EXTENSION
If the command is attempted for an extension that the object already
depends on, silently do nothing.
In particular, this means that if a database containing multiple such
entries is dumped, the restore will silently do the right thing and
record just the first one. (At least, in a world where pg_dump does
dump such entries -- which it doesn't currently, but it will.)
Backpatch to 9.6, where this kind of dependency was introduced.
Reviewed-by: Ibrar Ahmed, Tom Lane (offlist)
Discussion: https://postgr.es/m/20200217225333.GA30974@alvherre.pgsql
src/backend/catalog/pg_depend.c | 43 ++++++++++++++++++++++
src/backend/commands/alter.c | 7 +++-
src/include/catalog/dependency.h | 1 +
.../test_extensions/expected/test_extdepend.out | 2 +
.../modules/test_extensions/sql/test_extdepend.sql | 2 +
5 files changed, 54 insertions(+), 1 deletion(-)
diff --git a/src/backend/catalog/pg_depend.c b/src/backend/catalog/pg_depend.c
index 978e011fe5e..63741b31c42 100644
--- a/src/backend/catalog/pg_depend.c
+++ b/src/backend/catalog/pg_depend.c
@@ -485,6 +485,49 @@ getExtensionOfObject(Oid classId, Oid objectId)
return result;
}
+/*
+ * Return (possibly NIL) list of extensions that the given object depends on
+ * in DEPENDENCY_AUTO_EXTENSION mode.
+ */
+List *
+getAutoExtensionsOfObject(Oid classId, Oid objectId)
+{
+ List *result = NIL;
+ Relation depRel;
+ ScanKeyData key[2];
+ SysScanDesc scan;
+ HeapTuple tup;
+
+ depRel = heap_open(DependRelationId, AccessShareLock);
+
+ ScanKeyInit(&key[0],
+ Anum_pg_depend_classid,
+ BTEqualStrategyNumber, F_OIDEQ,
+ ObjectIdGetDatum(classId));
+ ScanKeyInit(&key[1],
+ Anum_pg_depend_objid,
+ BTEqualStrategyNumber, F_OIDEQ,
+ ObjectIdGetDatum(objectId));
+
+ scan = systable_beginscan(depRel, DependDependerIndexId, true,
+ NULL, 2, key);
+
+ while (HeapTupleIsValid((tup = systable_getnext(scan))))
+ {
+ Form_pg_depend depform = (Form_pg_depend) GETSTRUCT(tup);
+
+ if (depform->refclassid == ExtensionRelationId &&
+ depform->deptype == DEPENDENCY_AUTO_EXTENSION)
+ result = lappend_oid(result, depform->refobjid);
+ }
+
+ systable_endscan(scan);
+
+ heap_close(depRel, AccessShareLock);
+
+ return result;
+}
+
/*
* Detect whether a sequence is marked as "owned" by a column
*
diff --git a/src/backend/commands/alter.c b/src/backend/commands/alter.c
index acb580df880..6c197171dc3 100644
--- a/src/backend/commands/alter.c
+++ b/src/backend/commands/alter.c
@@ -425,6 +425,7 @@ ExecAlterObjectDependsStmt(AlterObjectDependsStmt *stmt, ObjectAddress *refAddre
ObjectAddress address;
ObjectAddress refAddr;
Relation rel;
+ List *currexts;
address =
get_object_address_rv(stmt->objectType, stmt->relation, (List *) stmt->object,
@@ -454,7 +455,11 @@ ExecAlterObjectDependsStmt(AlterObjectDependsStmt *stmt, ObjectAddress *refAddre
if (refAddress)
*refAddress = refAddr;
- recordDependencyOn(&address, &refAddr, DEPENDENCY_AUTO_EXTENSION);
+ /* Avoid duplicates */
+ currexts = getAutoExtensionsOfObject(address.classId,
+ address.objectId);
+ if (!list_member_oid(currexts, refAddr.objectId))
+ recordDependencyOn(&address, &refAddr, DEPENDENCY_AUTO_EXTENSION);
return address;
}
diff --git a/src/include/catalog/dependency.h b/src/include/catalog/dependency.h
index b7502722a27..f9b5d29674d 100644
--- a/src/include/catalog/dependency.h
+++ b/src/include/catalog/dependency.h
@@ -237,6 +237,7 @@ extern long changeDependencyFor(Oid classId, Oid objectId,
Oid newRefObjectId);
extern Oid getExtensionOfObject(Oid classId, Oid objectId);
+extern List *getAutoExtensionsOfObject(Oid classId, Oid objectId);
extern bool sequenceIsOwned(Oid seqId, char deptype, Oid *tableId, int32 *colId);
extern List *getOwnedSequences(Oid relid, AttrNumber attnum);
diff --git a/src/test/modules/test_extensions/expected/test_extdepend.out b/src/test/modules/test_extensions/expected/test_extdepend.out
index 11e441ddd37..40533e90de3 100644
--- a/src/test/modules/test_extensions/expected/test_extdepend.out
+++ b/src/test/modules/test_extensions/expected/test_extdepend.out
@@ -47,6 +47,8 @@ SELECT * FROM test_extdep_commands \gexec
CREATE INDEX e ON a (a1)
ALTER INDEX e DEPENDS ON EXTENSION test_ext5
RESET search_path
+-- A dependent object made dependent again has no effect
+ALTER FUNCTION test_ext.b() DEPENDS ON EXTENSION test_ext5;
-- make sure we have the right dependencies on the extension
SELECT deptype, p.*
FROM pg_depend, pg_identify_object(classid, objid, objsubid) AS p
diff --git a/src/test/modules/test_extensions/sql/test_extdepend.sql b/src/test/modules/test_extensions/sql/test_extdepend.sql
index cf44145dcb3..cc170ab7097 100644
--- a/src/test/modules/test_extensions/sql/test_extdepend.sql
+++ b/src/test/modules/test_extensions/sql/test_extdepend.sql
@@ -27,6 +27,8 @@ COPY test_extdep_commands FROM stdin;
SELECT * FROM test_extdep_commands;
-- First, test that dependent objects go away when the extension is dropped.
SELECT * FROM test_extdep_commands \gexec
+-- A dependent object made dependent again has no effect
+ALTER FUNCTION test_ext.b() DEPENDS ON EXTENSION test_ext5;
-- make sure we have the right dependencies on the extension
SELECT deptype, p.*
FROM pg_depend, pg_identify_object(classid, objid, objsubid) AS p
[parent: 475b061c8675]