hash/varchar_ops (class)

Hash operator class for text; member of text_ops.

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Object kind: Operator class
Index AM: Hash
Input type: text
Stored key type: Same as input type (catalog zero)
Default class: no
aliases: varchar_ops, hash/varchar_ops
signature: hash/varchar_ops
source oid: 未知

版本定义 PG 18

Hash operator class for text; member of text_ops.

Family operator strategies

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

Family support functions

Support number	Left type	Right type	Function signature	Result type
1	text	text	hashtext(text)	int4
2	text	text	hashtextextended(text,int8)	int8
1	name	name	hashname(name)	int4
2	name	name	hashnameextended(name,int8)	int8

Classes in this family

Class	Input type	Key type	Default
name_ops	name	Same as input type	yes
text_ops	text	Same as input type	yes
varchar_ops	text	Same as input type	no

比较版本

完整来源事实

class

{"default":"f","family":"text_ops","input_type":"text","key_type":"none","method":"hash","name":"varchar_ops"}

classes

map[default:t family:text_ops family_slug:family-hash-text_ops input_type:name key_type:none method:hash name:name_ops slug:class-hash-name_ops source_oid:], map[default:t family:text_ops family_slug:family-hash-text_ops input_type:text key_type:none method:hash name:text_ops slug:class-hash-text_ops source_oid:], map[default:f family:text_ops family_slug:family-hash-text_ops input_type:text key_type:none method:hash name:varchar_ops slug:class-hash-varchar_ops source_oid:]

operators

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

support functions

map[family:text_ops family_slug:family-hash-text_ops function:hashtext(text) left_type:text method:hash number:1 result_type:int4 right_type:text], map[family:text_ops family_slug:family-hash-text_ops function:hashtextextended(text,int8) left_type:text method:hash number:2 result_type:int8 right_type:text], map[family:text_ops family_slug:family-hash-text_ops function:hashname(name) left_type:name method:hash number:1 result_type:int4 right_type:name], map[family:text_ops family_slug:family-hash-text_ops function:hashnameextended(name,int8) left_type:name method:hash number:2 result_type:int8 right_type:name]

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