[GENERAL] A rare error

[DaVinci]

Hi, all.

An extrange behavior with PostgreSql 7.0.2:

        select * from foo where exists
        (select * from foo)

works fine. But:

        select * from foo where exists
        ((select * from foo))

shows an error:

        ERROR: parser: parse error at or near "("

Is this a bug?

Thanks.

                                        David