After an error - pg_replication_slot is dropped

Hi,

Please refer this straight forward scenario  against latest sources of v11.

[centos@centos-cpula bin]$ ./psql  postgres
psql (11devel)
Type "help" for help.

postgres=#  SELECT * FROM 
pg_create_logical_replication_slot('regression_slot1', 'test_decoding', 
true);
     slot_name     |    lsn
------------------+-----------
  regression_slot1 | 0/40001E8
(1 row)

postgres=#
postgres=# select * from pg_replication_slots;
     slot_name     |    plugin     | slot_type | datoid | database | 
temporary | active | active_pid | xmin | catalog_xmin | restart_lsn | 
confirmed_flush_lsn

------------------+---------------+-----------+--------+----------+-----------+--------+------------+------+--------------+-------------+---------------------
  regression_slot1 | test_decoding | logical   |  13220 | postgres | 
t         | t      |      28015 |      |          557 | 0/40001B0 | 
0/40001E8
(1 row)

--Try to again create  the same slot , getting an error - which is expected
postgres=#
postgres=#  SELECT * FROM 
pg_create_logical_replication_slot('regression_slot1', 'test_decoding', 
true);
ERROR:  replication slot "regression_slot1" already exists
postgres=#

--No slot found
postgres=# select * from pg_replication_slots;
  slot_name | plugin | slot_type | datoid | database | temporary | 
active | active_pid | xmin | catalog_xmin | restart_lsn | 
confirmed_flush_lsn

-----------+--------+-----------+--------+----------+-----------+--------+------------+------+--------------+-------------+---------------------
(0 rows)

-- 
regards,tushar
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