Function getObjectIdentityParts

src/backend/catalog/objectaddress.c:5082–6407

* As above, but more detailed. * * There are two sets of return values: the identity itself as a palloc'd * string is returned. objname and objargs, if not NULL, are output parameters * that receive lists of C-strings that are useful to give back to * get_object_address() to reconstruct the ObjectAddress. Returns NULL if * the object could not be found. */

 * the object could not be found.
 */
char *
getObjectIdentityParts(const ObjectAddress *object,
					   List **objname, List **objargs,
					   bool missing_ok)
{
	StringInfoData buffer;

	initStringInfo(&buffer);

	/*
	 * Make sure that both objname and objargs were passed, or none was; and
	 * initialize them to empty lists.  For objname this is useless because it
	 * will be initialized in all cases inside the switch; but we do it anyway
	 * so that we can test below that no branch leaves it unset.
	 */
	Assert(PointerIsValid(objname) == PointerIsValid(objargs));
	if (objname)
	{
		*objname = NIL;
		*objargs = NIL;
	}

	switch (getObjectClass(object))
	{
		case OCLASS_CLASS:
			{
				char	   *attr = NULL;

				/*
				 * Check for the attribute first, so as if it is missing we
				 * can skip the entire relation description.
				 */
				if (object->objectSubId != 0)
				{
					attr = get_attname(object->objectId,
									   object->objectSubId,
									   missing_ok);

					if (missing_ok && attr == NULL)
						break;
				}

				getRelationIdentity(&buffer, object->objectId, objname,
									missing_ok);
				if (objname && *objname == NIL)
					break;

				if (attr)
				{
					appendStringInfo(&buffer, ".%s",
									 quote_identifier(attr));
					if (objname)
						*objname = lappend(*objname, attr);
				}
			}
			break;

		case OCLASS_PROC: