Tom Lane wrote:
>Could be.  I went back to look at Sam Mason's report about three weeks
>ago, and it definitely seems to explain his issue.

I've just built a patched version as well and it appears to be doing
what I think is the right thing now.  I.e. actually picking the
plan with the lower cost.



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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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