Add table to regression tests for binary-compatibility checks in pg_upgrade
This commit adds to the main regression test suite a table with all the in-core data types (some exceptions apply). This table is not dropped, so as pg_upgrade would be able to check the binary compatibility of the types tracked in the table. If a new type is added in core, this part of the tests would need a refresh but the tests are designed to fail if that were to happen. As this is useful for upgrades and that these rely on the objects created in the regression test suite of the old version upgraded from, a backpatch down to 12 is done, which is the last point where a binary incompatible change has been done (7c15cef8). This will hopefully be enough to find out if something gets broken during the development of a new version of Postgres, so as it is possible to take actions in pg_upgrade itself in this case (like 0ccfc282 for sql_identifier). An area that is not covered yet is related to external modules, which may create their own types. The testing infrastructure of pg_upgrade is not integrated yet with the external modules stored in core (src/test/modules/ or contrib/, all use the same database name for their tests so there would be an overlap). This could be improved in the future. Author: Justin Pryzby Reviewed-by: Jacob Champion, Peter Eisentraut, Tom Lane, Michael Paquier Discussion: https://postgr.es/m/20201206180248.GI24052@telsasoft.com Backpatch-through: 12
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