Mark Kirkwood <[EMAIL PROTECTED]> writes:
> Tom Lane wrote:
>> Hmmm ... it strikes me that someone wanting this level of detail
>> would be better advised to look into the source code.  

> I did wonder about about it being better placed in 'internals'
> somewhere, but it seemed to follow on from the 'explain' and 'stats'
> sections quite well.

The internals section would be a good compromise.  ISTM that in the
context of the "performance tips" chapter, all that people really want
to know is that the planner uses the pg_statistic entries to estimate
numbers of matching rows --- just how it goes about it is irrelevant
detail at that point.

                        regards, tom lane

---------------------------(end of broadcast)---------------------------
TIP 9: the planner will ignore your desire to choose an index scan if your
      joining column's datatypes do not match

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