Hello all, We are using event triggers to capture DDL for subsequent replay on a logical replica.
The intention is to write the DDL statement to a table, inside the same transaction that executes the DDL, and have a separate process on the replica notice changes in this table and execute whatever it finds. We have declared a trigger on the ddl_command_end event for this purpose. We can get the SQL from running current_query() inside the trigger; oddly, the pg_event_trigger_ddl_commands() function does have an attribute called "command", typed as "pg_ddl_command", but there are no SQL functions that can operate on this type, including turning it into a string. This process works for a simple case of e.g. "CREATE TABLE t()". However, in other cases --- e.g. "DO $$ BEGIN CREATE TABLE t(); CREATE TABLE s(); END; $$;" --- the trigger will fire for each CREATE TABLE but the current_query() will evaluate to the entire DO block. This makes it difficult to capture just the actual statement that is being executed. I am looking for a way to get the precise statement that is being executed from within the ddl_command_event trigger function. Does anyone know if this is possible? Thanks, -Joe
