Function update_proconfig_value

src/backend/commands/functioncmds.c:848–871

* Update a proconfig value according to a list of VariableSetStmt items. * * The input and result may be NULL to signify a null entry. */

 * The input and result may be NULL to signify a null entry.
 */
static ArrayType *
update_proconfig_value(ArrayType *a, List *set_items)
{
	ListCell   *l;

	foreach(l, set_items)
	{
		VariableSetStmt *sstmt = lfirst_node(VariableSetStmt, l);

		if (sstmt->kind == VAR_RESET_ALL)
			a = NULL;
		else
		{
			char	   *valuestr = ExtractSetVariableArgs(sstmt);

			if (valuestr)
				a = GUCArrayAdd(a, sstmt->name, valuestr);
			else				/* RESET */
				a = GUCArrayDelete(a, sstmt->name);
		}
	}

	return a;
}

static Oid
interpret_func_support(DefElem *defel)