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PostgreSQL 9.6 目录变更
从一次升级开始，了解目录、字段与类型的变化。
对比任意两个版本，也可以沿着发布历史逐步探索。
比较包含 PostgreSQL 19 beta 3 快照，结果不代表最终发布结构。
PostgreSQL 9.5 → 9.6
+ aggcombinefn+ aggserialfn+ aggdeserialfn
+ amhandler+ amtype− amstrategies− amsupport− amcanorder− amcanorderbyop− amcanbackward− amcanunique− amcanmulticol− amoptionalkey− amsearcharray− amsearchnulls− amstorage− amclusterable− ampredlocks− amkeytype− aminsert− ambeginscan− amgettuple− amgetbitmap− amrescan− amendscan− ammarkpos− amrestrpos− ambuild− ambuildempty− ambulkdelete− amvacuumcleanup− amcanreturn− amcostestimate− amoptions
+ name+ setting
+ objoid+ classoid+ objsubid+ privtype+ initprivs
+ proparallel
+ confirmed_flush_lsn
+ wait_event_type+ wait_event− waiting
+ pid+ datid+ datname+ relid+ phase+ heap_blks_total+ heap_blks_scanned+ heap_blks_vacuumed+ index_vacuum_count+ max_dead_tuples+ num_dead_tuples
+ pid+ status+ receive_start_lsn+ receive_start_tli+ received_lsn+ received_tli+ last_msg_send_time+ last_msg_receipt_time+ latest_end_lsn+ latest_end_time+ slot_name+ conninfo