On 1/28/19 2:53 AM, Kuroda, Hayato wrote:
> BTW, I give you a suggestion about a test.
> This parameter enables users to log statements randomly, hence adding some 
> tests is very difficult.
> Perhaps Only three cases are available:
> 
> * When log_transaction_sample_rate is set to 1, all statements are logged.
> * When the parameter is set to 0, they are never logged.
> * When the parameter change to 0 inside the transaction, logging is 
> immediately stopped.

I agree we should add tests, my main problem is log output contains duration
information:

postgres=# select 1;
LOG:  duration: 0.539 ms  statement: select 1;

I did not find any test for log_min_duration that could help me. LCOV indicate
there is no tests on this part (look check_log_duration()):
https://coverage.postgresql.org/src/backend/tcop/postgres.c.gcov.html

I will look how to test this properly with test infrastructure. Maybe a simple
regex to remove duration part will be enough.

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