On Tue, Sep 21, 2010 at 10:58 PM, Pei He <hepeim...@gmail.com> wrote: > Hi Tom, > The bitmapset works for me. > > I want to implement the operator for the following query: > > Select * from a left join b on a.id = b.id order by b.id; > > In a left outer join, I want the tuples that have matches in the inner table > appear first. So, the order by clause is need.
Why can't you just write SELECT * FROM a LEFT JOIN b ON a.id = b.id ORDER BY b.id NULLS FIRST? "I want my query results in a different order" is almost never something that requires modifying the source code. -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise Postgres Company -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
