SYSTEM CATALOG · 系统目录

pg_amop

The catalog pg_amop stores information about operators associated with access method operator families. There is one row for each operator that is a member of an operator family. A family member can be either a search operator or an ordering operator. An operator can appear in more than one family, but cannot appear in more than one search position nor more than one ordering position within a family. (It is allowed, though unlikely, for an operator to be used for both search and ordering purposes.)

首次收录 PG 9.0最近收录 PG 19当前字段 9

9.0 9.1 9.2 9.3 9.4 9.5 9.6 10 11 12 13 14 15 16 17 18 19^β3

已与 PostgreSQL 18.6 实例逐字段核对 · 原始实测记录 ↗

字段结构 PostgreSQL 18

pg_amop

字段 / COLUMN	类型 / TYPE	说明 / DESCRIPTION
`oid`	`oid`NOT NULL	Row identifier
`amopfamily`	`oid`NOT NULL	The operator family this entry is for引用：`pg_opfamily.oid`
`amoplefttype`	`oid`NOT NULL	Left-hand input data type of operator引用：`pg_type.oid`
`amoprighttype`	`oid`NOT NULL	Right-hand input data type of operator引用：`pg_type.oid`
`amopstrategy`	`smallint`NOT NULL文档原写法：`int2`	Operator strategy number
`amoppurpose`	`"char"`NOT NULL文档原写法：`char`	Operator purpose, either s for search or o for ordering
`amopopr`	`oid`NOT NULL	OID of the operator引用：`pg_operator.oid`
`amopmethod`	`oid`NOT NULL	Index access method operator family is for引用：`pg_am.oid`
`amopsortfamily`	`oid`NOT NULL	The B-tree operator family this entry sorts according to, if an ordering operator; zero if a search operator引用：`pg_opfamily.oid`

标记“隐式列”的字段不包含在 SELECT * 中；部分早期统计视图由同版本源码补全，额外来源会显示在字段说明中。

通用系统列 6

PostgreSQL 提供的系统属性，通常不在 SELECT * 中展开。单独保留，不与普通字段混算。

字段	类型	attnum
`tableoid`	`oid`	-6
`cmax`	`cid`	-5
`xmax`	`xid`	-4
`cmin`	`cid`	-3
`xmin`	`xid`	-2
`ctid`	`tid`	-1

字段演化矩阵

悬停查看字段类型

存在新增 / 类型或属性变化移除

字段 / COLUMN	9.0	9.1	9.2	9.3	9.4	9.5	9.6	10	11	12	13	14	15	16	17	18	19
`oid`
`amopfamily`
`amoplefttype`
`amoprighttype`
`amopstrategy`
`amopopr`
`amopmethod`
`amoppurpose`	–
`amopsortfamily`	–

9.0 是收录基线；基线中已存在的字段不标记为新增。矩阵按字段名称对齐，重命名显示为旧字段移除与新字段新增。

演化时间线

相邻大版本的变化

PostgreSQL 12 ← 11

~ oid: 隐式列 → 常规列1 处字段说明更新

PostgreSQL 9.4 ← 9.3

1 处字段说明更新

PostgreSQL 9.3 ← 9.2

1 处字段说明更新

PostgreSQL 9.1 ← 9.0

+ amoppurpose+ amopsortfamily目录说明更新

比较任意两个版本

起始版本 / FROM目标版本 / TO包含描述更新

选择两个版本，查看字段的新增、移除与类型变化。交互比较需要 JavaScript；演化时间线可直接阅读。