hash/float8_ops (class)

Hash operator class for float8; member of float_ops.

当前阅读 PG 18·选择有来源记录的版本

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Object kind: Operator class
Index AM: Hash
Input type: float8
Stored key type: Same as input type (catalog zero)
Default class: yes
aliases: float8_ops, hash/float8_ops
signature: hash/float8_ops
source oid: 未知

版本定义 PG 18

Hash operator class for float8; member of float_ops.

Family operator strategies

Operator overload	Strategy	Purpose	Membership scope	Source description
=(float4,float4)	1	search	Family member	equal
=(float8,float8)	1	search	Class input pair	equal
=(float4,float8)	1	search	Family member	equal
=(float8,float4)	1	search	Family member	equal

Family support functions

Support number	Left type	Right type	Function signature	Result type
1	float4	float4	hashfloat4(float4)	int4
2	float4	float4	hashfloat4extended(float4,int8)	int8
1	float8	float8	hashfloat8(float8)	int4
2	float8	float8	hashfloat8extended(float8,int8)	int8

Classes in this family

Class	Input type	Key type	Default
float4_ops	float4	Same as input type	yes
float8_ops	float8	Same as input type	yes

比较版本

完整来源事实

class

{"default":"t","family":"float_ops","input_type":"float8","key_type":"none","method":"hash","name":"float8_ops"}

classes

map[default:t family:float_ops family_slug:family-hash-float_ops input_type:float4 key_type:none method:hash name:float4_ops slug:class-hash-float4_ops source_oid:], map[default:t family:float_ops family_slug:family-hash-float_ops input_type:float8 key_type:none method:hash name:float8_ops slug:class-hash-float8_ops source_oid:]

operators

map[description:equal family:float_ops family_slug:family-hash-float_ops left_type:float4 method:hash operator:=(float4,float4) operator_slug:op-3d-float4-float4 purpose:search result_type:bool right_type:float4 sort_family: sort_family_slug: strategy:1], map[description:equal family:float_ops family_slug:family-hash-float_ops left_type:float8 method:hash operator:=(float8,float8) operator_slug:op-3d-float8-float8 purpose:search result_type:bool right_type:float8 sort_family: sort_family_slug: strategy:1], map[description:equal family:float_ops family_slug:family-hash-float_ops left_type:float4 method:hash operator:=(float4,float8) operator_slug:op-3d-float4-float8 purpose:search result_type:bool right_type:float8 sort_family: sort_family_slug: strategy:1], map[description:equal family:float_ops family_slug:family-hash-float_ops left_type:float8 method:hash operator:=(float8,float4) operator_slug:op-3d-float8-float4 purpose:search result_type:bool right_type:float4 sort_family: sort_family_slug: strategy:1]

support functions

map[family:float_ops family_slug:family-hash-float_ops function:hashfloat4(float4) left_type:float4 method:hash number:1 result_type:int4 right_type:float4], map[family:float_ops family_slug:family-hash-float_ops function:hashfloat4extended(float4,int8) left_type:float4 method:hash number:2 result_type:int8 right_type:float4], map[family:float_ops family_slug:family-hash-float_ops function:hashfloat8(float8) left_type:float8 method:hash number:1 result_type:int4 right_type:float8], map[family:float_ops family_slug:family-hash-float_ops function:hashfloat8extended(float8,int8) left_type:float8 method:hash number:2 result_type:int8 right_type:float8]

来源引用

完整定义与证据 JSON

定义来源

center · PostgreSQL 18 · 555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f

正文语言: en · 555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f