Horton

Re: TIP 9: the planner will ignore... & datatypes

Alvaro Herrera <alvherre@surnet.cl>

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From: Alvaro Herrera <alvherre@surnet.cl>
To: Marc Mamin <m.mamin@gmx.net>
Cc: pgsql-performance@postgresql.org
Date: 2005-06-01T13:40:09Z
Lists: pgsql-performance 
On Wed, Jun 01, 2005 at 11:45:06AM +0200, Marc Mamin wrote:
> TIP 9: the planner will ignore your desire to choose an index scan if your
>       joining column's datatypes do not match
> 
> 
> But INT2, INT4, INT8 and "SERIAL" are considered to be a unique datatype.
> Am I Right?

No, they weren't when this tip was written.  As of 8.0 however this tip
is no longer the complete truth; we do allow cross-type index scans.

-- 
Alvaro Herrera (<alvherre[a]surnet.cl>)
"I suspect most samba developers are already technically insane...
Of course, since many of them are Australians, you can't tell." (L. Torvalds)