This may be totally irrelevant:
Our current load distributors, like pgpool, have no way of knowing the side effects of backend functions. It would be interesting if the client could send each potential query to the master saying, "execute this query if there are side effects, otherwise do no operation and and let me execute this read-only query on a replicated copy."
You can go 'SET TRANSACTION READ ONLY;' or something...
Chris
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