Hi, Both build_simple_rel() and build_join_rel() allocate RelOptInfo using makeNode(), which returned a zeroed out memory. The functions then assign values like false, NULL, 0 or NIL which essentially contain zero valued bytes. This looks like needless work. So, we are spending some CPU cycles unnecessarily in those assignments. That may not be much time wasted, but whenever someone adds a field to RelOptInfo, those functions need to be updated with possibly a zero value assignment. That looks like an unnecessary maintenance burden. Should we just drop all those zero value assignments from there? If there's any reason to have those assignments there, should we move the code to allocate RelOptInfo and assign zero values to a separate function and call it from those two functions? fetch_upper_rel() also has those kinds of assignments, but they are far fewer than build_*_rel().
-- Best Wishes, Ashutosh Bapat EnterpriseDB Corporation The Postgres Database Company -- Sent via pgsql-hackers mailing list (email@example.com) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers