presto-main/src/main/java/io/prestosql/sql/planner/iterative/rule/DesugarCurrentUser.java/DesugarCurrentUser/getCall
class DesugarCurrentUser:    public static FunctionCall getCall(CurrentUser node, Metadata metadata)
    {
        return new FunctionCallBuilder(metadata)
                .setName(QualifiedName.of("$current_user"))
                .build();
    }