Wrong return type for pg_clear_attribute_stats().
Author: Noriyoshi Shinoda
Discussion: https://postgr.es/m/DM4PR84MB17347944F27A552F0CCDF84CEE4C2@DM4PR84MB1734.NAMPRD84.PROD.OUTLOOK.COM
<parameter>relation</parameter> <type>regclass</type>,
<parameter>attname</parameter> <type>name</type>,
<parameter>inherited</parameter> <type>boolean</type> )
- <returnvalue>boolean</returnvalue>
+ <returnvalue>void</returnvalue>
</para>
<para>
Clears table-level statistics for the given relation attribute, as