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This commit adds the possibility to define TOAST tables with oid8 as their chunk_id, based on the reloption toast_value_type. All the external TOAST pointers still rely on varatt_external_oid and a single vartag. The values inserted in the oid8 TOAST tables are fed from the OID8 value generator, casted to OID for now, as we do not have a vartag_external able to store Oid8 values yet. An upcoming commit will add support for a new vartag_external and its associated structures, with the code being able to use a different on-disk external TOAST pointer depending on the attribute type of chunk_id defined in TOAST relations. All the changes done here are mechanical, mostly around the TOAST code that needs to be able to do chunk_id lookups based on the two types now supported. Bump catalog version. Author: Michael Paquier <michael@paquier.xyz> Reviewed-by: Greg Burd <greg@burd.me> Reviewed-by: Bharath Rupireddy <bharath.rupireddyforpostgres@gmail.com> Reviewed-by: Yugo Nagata <nagata@sraoss.co.jp> Discussion: https://postgr.es/m/af19kUjwjhaoUTLn@paquier.xy