Function GetRumIndexHandler

pg_documentdb/src/index_am/rum.c:354–388

static IndexAmRoutine *
GetRumIndexHandler(PG_FUNCTION_ARGS)
{
	IndexAmRoutine *indexRoutine = palloc0(sizeof(IndexAmRoutine));

	EnsureRumLibLoaded();
	*indexRoutine = rum_index_routine;

	/* add a new proc as a config prog. */
	/* Based on https://github.com/postgrespro/rum/blob/master/src/rumutil.c#L117 */
	/* AMsupport is the index of the largest support function. We point to the options proc */
	uint16 RUMNProcs = indexRoutine->amsupport;
	if (RUMNProcs < 11)
	{
		indexRoutine->amsupport = RUMNProcs + 1;

		/* register the user config proc number. */
		/* based on https://github.com/postgrespro/rum/blob/master/src/rum.h#L837 */
		/* RUMNprocs is the count, and the highest function supported */
		/* We set our config proc to be one above that */
		indexRoutine->amoptsprocnum = RUMNProcs + 1;
	}

	indexRoutine->ambeginscan = extension_rumbeginscan;
	indexRoutine->amrescan = extension_rumrescan;
	indexRoutine->amgetbitmap = extension_amgetbitmap;
	indexRoutine->amgettuple = extension_amgettuple;
	indexRoutine->amendscan = extension_rumendscan;
	indexRoutine->amcostestimate = extension_rumcostestimate;
	indexRoutine->ambuild = extension_rumbuild;
	indexRoutine->aminsert = extension_ruminsert;
	indexRoutine->amcanreturn = NULL;

	return indexRoutine;
}


void