Just noticed a small cosmetic point in the logs when logging statement
performance data: if a statement accesses 0 blocks, the "hit rate" is
given as 0%.

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I can see that that makes sense mathematically--insofar as 0/0 makes
mathematical sense at all--but wouldn't it be more helpful to represent
this as a 100% hit rate?
I guess computing hit rate as the limit of 0/x is as valid as computing
the limit of x/x (with x being the number of accesses that approaches
zero). But when I look at the logs I find myself going "low hit rate
here--oh wait, that's for zero accesses" all the time. Or would the
change make other people "good hit rate here--oh wait, that's for zero
accesses"?
Jeroen
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