A.50. Release 3.6.20

Check if socket file exists at startup and remove them if PID file doesn't exist to avoid bind() failure. (Bo Peng)

Fix incorrect query rewriting in native replication mode. (bug 551) (Bo Peng)

Doc: Update documentation and fix documentation typos. (Takuma Hoshiai, Tatsuo Ishii, Bo Peng)

Fix pgpool_setup to support PostgreSQL 12. (Tatsuo Ishii)

Fix occasional regression test failure. (Tatsuo Ishii)

Fix replication delay worker segfault when application_name in primary_conninfo is an empty string. (bug 565) (Tatsuo Ishii)

Fix the bug with ignored syslog setting. (Bo Peng)