Bruce Momjian <[EMAIL PROTECTED]> writes:
> Simon Riggs wrote:
>> Reason for no documentation was that CREATE INDEX and CREATE TABLE AS
>> SELECT already use this optimisation, but to my knowledge neither was/is
>> documented on those command pages.

> I wasn't aware those used the optimization.  Seems they all should be
> documented somewhere.

We don't document every single optimization in the system ... if we did,
the docs would be as big as the source code and equally unreadable by
non-programmers.  I think it's a much better idea just to mention it one
place and not try to enumerate exactly which commands have the optimization.

                        regards, tom lane

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TIP 9: In versions below 8.0, the planner will ignore your desire to
       choose an index scan if your joining column's datatypes do not

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