The following documentation comment has been logged on the website:
Page: https://www.postgresql.org/docs/17/sql-cluster.html
Description:
The documentation does not say what happens if you do "CLUSTER tablename"
and omit the USING clause, which is shown as optional in the BNF, if I'm
reading it right. Does CLUSTER use the PRIMARY KEY in that case? What if
no PRIMARY KEY is specified?