3a09d75b4f
It turns out that worker.c's code path for TRUNCATE was also careless about establishing a snapshot while executing user-defined code, allowing the checks added by commit 84f5c2908 to fail when a trigger is fired in that context. We could just wrap Push/PopActiveSnapshot around the truncate call, but it seems better to establish a policy of holding a snapshot throughout execution of a replication step. To help with that and possible future requirements, replace the previous ensure_transaction calls with pairs of begin/end_replication_step calls. Per report from Mark Dilger. Back-patch to v11, like the previous changes. Discussion: https://postgr.es/m/B4A3AF82-79ED-4F4C-A4E5-CD2622098972@enterprisedb.com
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