Postgresql Extend the logical decoding output plugin API with stream methods.

Source Link:

Untitled Git - postgresql.git/commit

Extend the logical decoding output plugin API with stream methods.    
author	Amit Kapila <akapila@postgresql.org>	    
Tue, 28 Jul 2020 10:36:44 +0800 (08:06 +0530)    
committer	Amit Kapila <akapila@postgresql.org>	    
Tue, 28 Jul 2020 10:39:44 +0800 (08:09 +0530)    
commit	45fdc9738b36d1068d3ad8fdb06436d6fd14436b    
tree	1168c9368d1d3c0e7daa47f82c5f8531ed0197c5	tree | snapshot    
parent	13838740f61fc455aa4196d257efc0b761daba1f	commit | diff    
Extend the logical decoding output plugin API with stream methods.    
    
This adds seven methods to the output plugin API, adding support for    
streaming changes of large in-progress transactions.    
    
* stream_start    
* stream_stop    
* stream_abort    
* stream_commit    
* stream_change    
* stream_message    
* stream_truncate    
    
Most of this is a simple extension of the existing methods, with    
the semantic difference that the transaction (or subtransaction)    
is incomplete and may be aborted later (which is something the    
regular API does not really need to deal with).    
    
This also extends the 'test_decoding' plugin, implementing these    
new stream methods.    
    
The stream_start/start_stop are used to demarcate a chunk of changes    
streamed for a particular toplevel transaction.    
    
This commit simply adds these new APIs and the upcoming patch to "allow    
the streaming mode in ReorderBuffer" will use these APIs.

I like to learn new and better ways of doing things when working on a scale, and feel free to ask questions and make suggestions.
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