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If an out-of-memory error was thrown at an unfortunate time, ensure_record_cache_typmod_slot_exists() could leak memory and leave behind a global state that produced an infinite loop on the next call. Fix by merging RecordCacheArray and RecordIdentifierArray into a single array. With only one allocation or re-allocation, there is no intermediate state. Back-patch to all supported releases. Reported-by: "James Pang (chaolpan)" <chaolpan@cisco.com> Reviewed-by: Michael Paquier <michael@paquier.xyz> Discussion: https://postgr.es/m/PH0PR11MB519113E738814BDDA702EDADD6EFA%40PH0PR11MB5191.namprd11.prod.outlook.com