Function extractRelOptions

src/backend/access/common/reloptions.c:1409–1456

* Extract and parse reloptions from a pg_class tuple. * * This is a low-level routine, expected to be used by relcache code and * callers that do not have a table's relcache entry (e.g. autovacuum). For * other uses, consider grabbing the rd_options pointer from the relcache entry * instead. * * tupdesc is pg_class' tuple descriptor. amoptions is a pointer to the index * AM's options par

 * index, or NULL otherwise.
 */
bytea *
extractRelOptions(HeapTuple tuple, TupleDesc tupdesc,
				  reloption_function amoptions)
{
	bytea	   *options;
	bool		isnull;
	Datum		datum;
	Form_pg_class classForm;

	datum = fastgetattr(tuple,
						Anum_pg_class_reloptions,
						tupdesc,
						&isnull);
	if (isnull)
		return NULL;

	classForm = (Form_pg_class) GETSTRUCT(tuple);

	/* Parse into appropriate format; don't error out here */
	switch (classForm->relkind)
	{
		case RELKIND_RELATION:
		case RELKIND_TOASTVALUE:
		case RELKIND_MATVIEW:
		case RELKIND_DIRECTORY_TABLE:
			options = table_reloptions((tamoptions_function)amoptions, datum, classForm->relkind, false);
			break;
		case RELKIND_PARTITIONED_TABLE:
			options = partitioned_table_reloptions(datum, false);
			break;
		case RELKIND_VIEW:
			options = view_reloptions(datum, false);
			break;
		case RELKIND_INDEX:
		case RELKIND_PARTITIONED_INDEX:
			options = index_reloptions((amoptions_function)amoptions, datum, false);
			break;
		case RELKIND_FOREIGN_TABLE:
			options = NULL;
			break;
		default:
			Assert(false);		/* can't get here */
			options = NULL;		/* keep compiler quiet */
			break;
	}

	return options;
}

static void
parseRelOptionsInternal(Datum options, bool validate,