Function EventTriggerSQLDropAddObject

src/backend/commands/event_trigger.c:1200–1311

* Register one object as being dropped by the current command. */

 * Register one object as being dropped by the current command.
 */
void
EventTriggerSQLDropAddObject(const ObjectAddress *object, bool original, bool normal)
{
	SQLDropObject *obj;
	MemoryContext oldcxt;

	if (!currentEventTriggerState)
		return;

	Assert(EventTriggerSupportsObjectClass(getObjectClass(object)));

	/* don't report temp schemas except my own */
	if (object->classId == NamespaceRelationId &&
		(isAnyTempNamespace(object->objectId) &&
		 !isTempNamespace(object->objectId)))
		return;

	oldcxt = MemoryContextSwitchTo(currentEventTriggerState->cxt);

	obj = palloc0(sizeof(SQLDropObject));
	obj->address = *object;
	obj->original = original;
	obj->normal = normal;

	/*
	 * Obtain schema names from the object's catalog tuple, if one exists;
	 * this lets us skip objects in temp schemas.  We trust that
	 * ObjectProperty contains all object classes that can be
	 * schema-qualified.
	 */
	if (is_objectclass_supported(object->classId))
	{
		Relation	catalog;
		HeapTuple	tuple;

		catalog = table_open(obj->address.classId, AccessShareLock);
		tuple = get_catalog_object_by_oid(catalog,
										  get_object_attnum_oid(object->classId),
										  obj->address.objectId);

		if (tuple)
		{
			AttrNumber	attnum;
			Datum		datum;
			bool		isnull;

			attnum = get_object_attnum_namespace(obj->address.classId);
			if (attnum != InvalidAttrNumber)
			{
				datum = heap_getattr(tuple, attnum,
									 RelationGetDescr(catalog), &isnull);
				if (!isnull)
				{
					Oid			namespaceId;

					namespaceId = DatumGetObjectId(datum);
					/* temp objects are only reported if they are my own */
					if (isTempNamespace(namespaceId))