Hi all, I was trying writing my own parallel aggregation functions on 9.6beta2. During that, we found a bit confusing behavior with SAFE/UNSAFE options.
Once a PARALLEL UNSAFE function f1_unsafe() is wrapped by a PARALLEL SAFE function f1_safe_unsafe(), calling f1_safe_unsafe() produces a parallel execution plan despite it implicitly calls the UNSAFE FUNCTION f1_unsafe(). Is this intentional? Please take a look at our example here: https://gist.github.com/snaga/362a965683fb2581bc693991b1fcf721 According to the manual, it is described as: > the presence of such a function in an SQL statement forces a serial execution > plan. so, I expected that calling UNSAFE functions should produce a non-parallel execution plan even wrapped in SAFE functions. Is this a sort of limitations? Is this working correctly as we expected? Regards,  https://www.postgresql.org/docs/9.6/static/sql-createfunction.html -- Satoshi Nagayasu <sn...@uptime.jp> -- Sent via pgsql-hackers mailing list (email@example.com) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers