A rare error - Mailing list pgsql-general

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