Hmmm. On second thought, maybe one or the other is enough, either restrict the parameter to values where the approximation is good, or put out a clear documentation about when the approximation is not very good, but it may be still useful even if not precise.

So I would be in favor of expanding the documentation but not restricting the parameter beyond avoiding value 1.0.

I have removed restriction and expanded documentation in attaching patch v5. 

Also I have recorded patch to CF 2017-09 —

Attachment: pgbench-zipf-05v.patch
Description: Binary data

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

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