Function DecodeTextArrayToBitmapset

src/backend/utils/cache/evtcache.c:220–245

* Decode text[] to a Bitmapset of CommandTags. * * We could avoid a bit of overhead here if we were willing to duplicate some * of the logic from deconstruct_array, but it doesn't seem worth the code * complexity. */

 * complexity.
 */
static Bitmapset *
DecodeTextArrayToBitmapset(Datum array)
{
	ArrayType  *arr = DatumGetArrayTypeP(array);
	Datum	   *elems;
	Bitmapset  *bms;
	int			i;
	int			nelems;

	if (ARR_NDIM(arr) != 1 || ARR_HASNULL(arr) || ARR_ELEMTYPE(arr) != TEXTOID)
		elog(ERROR, "expected 1-D text array");
	deconstruct_array(arr, TEXTOID, -1, false, TYPALIGN_INT,
					  &elems, NULL, &nelems);

	for (bms = NULL, i = 0; i < nelems; ++i)
	{
		char	   *str = TextDatumGetCString(elems[i]);

		bms = bms_add_member(bms, GetCommandTagEnum(str));
		pfree(str);
	}

	pfree(elems);

	return bms;
}

/*
 * Flush all cache entries when pg_event_trigger is updated.