Hello, Fabien

I am attaching patch v7.

> Yes, I agree. a >= 10000 does not make much sense... If you want uniform you 
> should use random(), not call random_zipfian with a = 10000. Basically it 
> suggests that too large values of "a" should be rejected. Not sure where to 
> put the limit, though.

I set upper bound for parameter to be equal to 1000.
> Yes, as a general principle I think that the documentation should reflect the 
> implementation.

Documentation have been updated, I have removed algorithms descriptions and put 
references to them there.

Attachment: pgbench-zipf-07v.patch
Description: Binary data

Thanks and Regards,
Alik Khilazhev
Postgres Professional:
The Russian Postgres Company

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