presto-parser/src/main/java/io/prestosql/sql/parser/AstBuilder.java/AstBuilder/visitGroupingOperation
class AstBuilder:    @Override
    public Node visitGroupingOperation(SqlBaseParser.GroupingOperationContext context)
    {
        List<QualifiedName> arguments = context.qualifiedName().stream()
                .map(this::getQualifiedName)
                .collect(toList());

        return new GroupingOperation(Optional.of(getLocation(context)), arguments);
    }