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Commit a8fd13cab0 added support for prepared transactions to built-in logical replication via a new option "two_phase" for a subscription. The "two_phase" option was not allowed with the existing streaming option. This commit permits the combination of "streaming" and "two_phase" subscription options. It extends the pgoutput plugin and the subscriber side code to add the prepare API for streaming transactions which will apply the changes accumulated in the spool-file at prepare time. Author: Peter Smith and Ajin Cherian Reviewed-by: Vignesh C, Amit Kapila, Greg Nancarrow Tested-By: Haiying Tang Discussion: https://postgr.es/m/02DA5F5E-CECE-4D9C-8B4B-418077E2C010@postgrespro.ru Discussion: https://postgr.es/m/CAMGcDxeqEpWj3fTXwqhSwBdXd2RS9jzwWscO-XbeCfso6ts3+Q@mail.gmail.com