presto-parser/src/main/java/io/prestosql/sql/parser/AstBuilder.java/AstBuilder/visitShowRoleGrants
class AstBuilder:    @Override
    public Node visitShowRoleGrants(SqlBaseParser.ShowRoleGrantsContext context)
    {
        return new ShowRoleGrants(
                getLocation(context),
                getIdentifierIfPresent(context.identifier()));
    }