brin/float4_minmax_ops (class)

说明

float4 类型的 BRIN 操作符类，属于 float_minmax_ops 家族。

对象种类

操作符类

索引访问方法

BRIN

输入类型

float4

存储键类型

float4

默认操作符类

是

用法

brin/float4_minmax_ops

操作符类与家族

一个索引定义可以为索引的每一列指定一个 操作符类 。

操作符类标识该索引在该列上要使用哪些操作符。例如，类型 int4 上的一个 B-树索引会使用 int4_ops 类；这个操作符类包含对 int4 值进行比较所需的函数。实践中，列数据类型的默认操作符类通常已经足够。之所以存在操作符类，主要是因为对某些数据类型来说，可能存在多种有意义的索引行为。例如，我们可能希望按绝对值排序一种复数数据类型，也可能希望按实部排序。我们可以通过为该数据类型定义两个操作符类，并在创建索引时选择合适的那个来做到这一点。操作符类决定了基础排序顺序（之后还可以通过添加排序选项 COLLATE 、 ASC / DESC 和/或 NULLS FIRST / NULLS LAST 来修改）。

除了默认操作符类之外，还有一些内置操作符类：

相关条目

• BRIN 索引访问方法
• float_minmax_ops 家族
• float4 数据类型
• float4 数据类型

文档与源码

• Matching PostgreSQL source archive
• PostgreSQL 18 English manual: indexes-opclass.html
• PostgreSQL 18 English manual: catalog-pg-opclass.html
• PostgreSQL 18 English manual: catalog-pg-amop.html
• PostgreSQL 18 English manual: catalog-pg-amproc.html

版本比较

PostgreSQL 13 → 14: 属性变化。

以下差异保留原始字段名与英文源描述。

--- PostgreSQL 13
+++ PostgreSQL 14
@@ -241,7 +241,7 @@
     {
       "family": "float_minmax_ops",
       "function": "brin_minmax_opcinfo(internal)",
-      "left_type": "float4",
+      "left_type": "float8",
       "method": "brin",
       "number": "1",
       "result_type": "internal",
@@ -249,116 +249,44 @@
     },
     {
       "family": "float_minmax_ops",
-      "function": "brin_minmax_opcinfo(internal)",
-      "left_type": "float8",
-      "method": "brin",
-      "number": "1",
-      "result_type": "internal",
+      "function": "brin_minmax_add_value(internal,internal,internal,internal)",
+      "left_type": "float4",
+      "method": "brin",
+      "number": "2",
+      "result_type": "bool",
       "right_type": "float4"
     },
     {
       "family": "float_minmax_ops",
-      "function": "brin_minmax_opcinfo(internal)",
-      "left_type": "float8",
-      "method": "brin",
-      "number": "1",
-      "result_type": "internal",
+      "function": "brin_minmax_add_value(internal,internal,internal,internal)",
+      "left_type": "float8",
+      "method": "brin",
+      "number": "2",
+      "result_type": "bool",
       "right_type": "float8"
     },
     {
       "family": "float_minmax_ops",
-      "function": "brin_minmax_add_value(internal,internal,internal,internal)",
-      "left_type": "float4",
-      "method": "brin",
-      "number": "2",
+      "function": "brin_minmax_consistent(internal,internal,internal)",
+      "left_type": "float4",
+      "method": "brin",
+      "number": "3",
       "result_type": "bool",
       "right_type": "float4"
     },
     {
       "family": "float_minmax_ops",
-      "function": "brin_minmax_add_value(internal,internal,internal,internal)",
-      "left_type": "float4",
-      "method": "brin",
-      "number": "2",
+      "function": "brin_minmax_consistent(internal,internal,internal)",
+      "left_type": "float8",
+      "method": "brin",
+      "number": "3",
       "result_type": "bool",
       "right_type": "float8"
     },
     {
       "family": "float_minmax_ops",
-      "function": "brin_minmax_add_value(internal,internal,internal,internal)",
-      "left_type": "float8",
-      "method": "brin",
-      "number": "2",
-      "result_type": "bool",
-      "right_type": "float4"
-    },
-    {
-      "family": "float_minmax_ops",
-      "function": "brin_minmax_add_value(internal,internal,internal,internal)",
-      "left_type": "float8",
-      "method": "brin",
-      "number": "2",
-      "result_type": "bool",
-      "right_type": "float8"
-    },
-    {
-      "family": "float_minmax_ops",
-      "function": "brin_minmax_consistent(internal,internal,internal)",
-      "left_type": "float4",
-      "method": "brin",
-      "number": "3",
-      "result_type": "bool",
-      "right_type": "float4"
-    },
-    {
-      "family": "float_minmax_ops",
-      "function": "brin_minmax_consistent(internal,internal,internal)",
-      "left_type": "float4",
-      "method": "brin",
-      "number": "3",
-      "result_type": "bool",
-      "right_type": "float8"
-    },
-    {
-      "family": "float_minmax_ops",
-      "function": "brin_minmax_consistent(internal,internal,internal)",
-      "left_type": "float8",
-      "method": "brin",
-      "number": "3",
-      "result_type": "bool",
-      "right_type": "float4"
-    },
-    {
-      "family": "float_minmax_ops",
-      "function": "brin_minmax_consistent(internal,internal,internal)",
-      "left_type": "float8",
-      "method": "brin",
-      "number": "3",
-      "result_type": "bool",
-      "right_type": "float8"
-    },
-    {
-      "family": "float_minmax_ops",
       "function": "brin_minmax_union(internal,internal,internal)",
       "left_type": "float4",
-      "method": "brin",
-      "number": "4",
-      "result_type": "bool",
-      "right_type": "float4"
-    },
-    {
-      "family": "float_minmax_ops",
-      "function": "brin_minmax_union(internal,internal,internal)",
-      "left_type": "float4",
-      "method": "brin",
-      "number": "4",
-      "result_type": "bool",
-      "right_type": "float8"
-    },
-    {
-      "family": "float_minmax_ops",
-      "function": "brin_minmax_union(internal,internal,internal)",
-      "left_type": "float8",
       "method": "brin",
       "number": "4",
       "result_type": "bool",

比较已记录的接口与属性，排除来源指纹和构建元数据。某个样本中没有记录，不能据此判断实际引入或移除的版本。

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