Function getObjectDescription

src/backend/catalog/objectaddress.c:3064–4300

* getObjectDescription: build an object description for messages * * The result is a palloc'd string. NULL is returned for an undefined * object if missing_ok is true, else an error is generated. */

 * object if missing_ok is true, else an error is generated.
 */
char *
getObjectDescription(const ObjectAddress *object, bool missing_ok)
{
	StringInfoData buffer;

	initStringInfo(&buffer);

	switch (getObjectClass(object))
	{
		case OCLASS_CLASS:
			if (object->objectSubId == 0)
				getRelationDescription(&buffer, object->objectId, missing_ok);
			else
			{
				/* column, not whole relation */
				StringInfoData rel;
				char	   *attname = get_attname(object->objectId,
												  object->objectSubId,
												  missing_ok);

				if (!attname)
					break;

				initStringInfo(&rel);
				getRelationDescription(&rel, object->objectId, missing_ok);
				/* translator: second %s is, e.g., "table %s" */
				appendStringInfo(&buffer, _("column %s of %s"),
								 attname, rel.data);
				pfree(rel.data);
			}
			break;

		case OCLASS_PROC:
			{
				bits16		flags = FORMAT_PROC_INVALID_AS_NULL;
				char	   *proname = format_procedure_extended(object->objectId,
																flags);

				if (proname == NULL)
					break;

				appendStringInfo(&buffer, _("function %s"), proname);
				break;
			}

		case OCLASS_TYPE:
			{
				bits16		flags = FORMAT_TYPE_INVALID_AS_NULL;
				char	   *typname = format_type_extended(object->objectId, -1,
														   flags);

				if (typname == NULL)
					break;

				appendStringInfo(&buffer, _("type %s"), typname);
				break;
			}