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doc: Document factorial function

Peter Eisentraut <peter@eisentraut.org>

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Commit: 4c5cf5431410f8e28fb855c892cb2880649df850
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2020-06-16T03:04:33Z
Releases: 14.0 
doc: Document factorial function

This has existed for a very long time, equivalent to the ! and !!
operators, but it was never documented.

Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://www.postgresql.org/message-id/flat/6ce1df0e-86a3-e544-743a-f357ff663f68%402ndquadrant.com

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