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ea97e440b8
Previously it was allowed to set default_table_access_method to an empty string. That makes sense for default_tablespace, where that was copied from, as it signals falling back to the database's default tablespace. As there is no equivalent for table AMs, forbid that. Also make sure to throw a usable error when creating a table using an index AM, by using get_am_type_oid() to implement get_table_am_oid() instead of a separate copy. Previously we'd error out only later, in GetTableAmRoutine(). Thirdly remove GetTableAmRoutineByAmId() - it was only used in an earlier version of 8586bf7ed8. Add tests for the above (some for index AMs as well).