Robert Haas <> writes:
> On Wed, May 24, 2017 at 3:16 AM, Tsunakawa, Takayuki
> <> wrote:
>> For this, I added a GUC_REPORT variable session_read_only which indicates 
>> the session's default read-only status.  The characteristics are:
>> * It cannot be changed directly by the user (postgresql.conf, SET, etc.)
>> * Its value is the same as default_transaction_read_only when not in 
>> recovery.

I didn't look at exactly how you tried to do that, but GUCs whose values
depend on other GUCs generally don't work well at all.

>> * Its value is false during recovery.

[ scratches head... ]  Surely this should read as "true" during recovery?
Also, what happens if the standby server goes live mid-session?

>> Could you include this in PG 10?

I concur with Robert that this is too late for v10, and the argument to
shove it in anyway is not compelling.

                        regards, tom lane

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