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Doc: update description of random() function.

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Commit 3804539e4 neglected to update the documentation's claim that
random() uses a "linear congruential algorithm".  In hopes of avoiding
the same mistake if someone replaces our PRNG again, just say it's a
deterministic pseudo-random number generator and leave it at that.
Anybody who really wants to know can look in the source code.

COMPATIBILITY NOTE FOR RELEASE NOTES: 3804539e4's commit message
really should have mentioned that the random() sequence after
setseed(), while still repeatable, will differ from what you got
in pre-v15 releases.

Noted by Dagfinn Ilmari Mannsåker; wording suggestion by Dean Rasheed.

Discussion: https://postgr.es/m/875ynfpiru.fsf@wibble.ilmari.org
This commit is contained in:
Tom Lane 2022-04-12 11:36:45 -04:00
parent e7cc4a6e3d
commit d4f109e4a2
1 changed files with 3 additions and 2 deletions
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doc/src/sgml/func.sgml
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@ -1832,8 +1832,9 @@ repeat('Pg', 4) <returnvalue>PgPgPgPg</returnvalue>
</table>
<para>
The <function>random()</function> function uses a simple linear
congruential algorithm. It is fast but not suitable for cryptographic
The <function>random()</function> function uses a deterministic
pseudo-random number generator.
It is fast but not suitable for cryptographic
applications; see the <xref linkend="pgcrypto"/> module for a more
secure alternative.
If <function>setseed()</function> is called, the series of results of