On 05/01/2015 07:24 PM, Josh Berkus wrote:
O
(A possible compromise position would be to offer a new GUC to
enable/disable the optimization globally; that would add only a reasonably
small amount of control code, and people who were afraid of the change
breaking their apps would probably want a global disable anyway.)
We'd need the GUC. I know of a lot of cases where people are using WITH
clauses specifically to override the query planner, and requiring them
to edit all of their queries in order to enable the old behavior would
become an upgrade barrier.
+100
This could be a very bad, almost impossible to catch, behaviour break.
Even if we add the GUC, we're probably going to be imposing very
significant code audit costs on some users.
cheers
andrew
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