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Several statements need to reference the current connection's current database name and current port value. Until now, this has been accomplished by creating dynamic SQL statements inside of a DO block, which is not as easy to parse. It also takes away some of the granularity of any error messages that might occur, making debugging harder. By capturing the connection-specific settings into psql variables, it becomes possible to write simpler SQL statements for the FDW objects. This eliminates most of DO blocks used in this test, making it a bit more readable and shorter. Author: Author: Corey Huinker <corey.huinker@gmail.com> Discussion: https://postgr.es/m/CADkLM=cpUiJ3QF7aUthTvaVMmgQcm7QqZBRMDLhBRTR+gJX-Og@mail.gmail.com