title: Destination of PostgreSQL logs
body: <p>I tuned the server's variables almost like told <a href="https://stackoverflow.com/questions/722221/how-to-log-postgres-sql-queries">here</a>, but the log_destination is 'csvlog'.
  After that in the data directory:</p>
  
  <ul>
  <li>the *.log file is empty. </li>
  <li>the file with same name but with .csv extension holds the logs from the server.</li>
  </ul>
  
  <p>Explain me please -- this is correct behaviour?</p>
  
  <p>If log_destination is 'csvlog' -- the output file will have the *.csv extension, rather  than .log?</p>
  
  <p>What log_destination should be, to write logs in to the *.log file?</p>
  
  <p>Thanks!</p>