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>F.40. test_decoding</A
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>  <TT
CLASS="FILENAME"
>test_decoding</TT
> is an example of a logical decoding
  output plugin. It doesn't do anything especially useful, but can serve as
  a starting point for developing your own output plugin.
 </P
><P
>  <TT
CLASS="FILENAME"
>test_decoding</TT
> receives WAL through the logical decoding
  mechanism and decodes it into text representations of the operations
  performed.
 </P
><P
>  Typical output from this plugin, used over the SQL logical decoding
  interface, might be:

</P><PRE
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>postgres=# SELECT * FROM pg_logical_slot_get_changes('test_slot', NULL, NULL, 'include-xids', '0');
 location  | xid |                       data
-----------+-----+--------------------------------------------------
 0/16D30F8 | 691 | BEGIN
 0/16D32A0 | 691 | table public.data: INSERT: id[int4]:2 data[text]:'arg'
 0/16D32A0 | 691 | table public.data: INSERT: id[int4]:3 data[text]:'demo'
 0/16D32A0 | 691 | COMMIT
 0/16D32D8 | 692 | BEGIN
 0/16D3398 | 692 | table public.data: DELETE: id[int4]:2
 0/16D3398 | 692 | table public.data: DELETE: id[int4]:3
 0/16D3398 | 692 | COMMIT
(8 rows)</PRE
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