Re: CPU costs of random_zipfian in pgbench

The following review has been posted through the commitfest application:
make installcheck-world:  not tested
Implements feature:       not tested
Spec compliant:           not tested
Documentation:            not tested

For whatever it is worth, the patch looks good to me.

A minor nitpick would be to use a verb in the part:

`cost when the parameter in (0, 1)`

maybe:

`cost when the parameter's value is in (0, 1)` or similar.

Apart from that, I would suggest it that the patch could be moved to
Waiting for Author state.