hash/varchar_pattern_ops (class)

Hash operator class for text; member of text_pattern_ops.

Reading PG 18·Select a recorded version

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

Definition PG 18

Hash operator class for text; member of text_pattern_ops.

Family operator strategies

Operator overload	Strategy	Purpose	Ordering family	Membership scope	Source description
=(text,text)	1	search		Class input pair	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

Classes in this family

Class	Input type	Key type	Default
text_pattern_ops	text	Same as input type	no
varchar_pattern_ops	text	Same as input type	no

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Complete source facts

class

{"default":"f","family":"text_pattern_ops","input_type":"text","key_type":"none","method":"hash","name":"varchar_pattern_ops"}

classes

map[default:f family:text_pattern_ops family_slug:family-hash-text_pattern_ops input_type:text key_type:none method:hash name:text_pattern_ops slug:class-hash-text_pattern_ops source_oid:], map[default:f family:text_pattern_ops family_slug:family-hash-text_pattern_ops input_type:text key_type:none method:hash name:varchar_pattern_ops slug:class-hash-varchar_pattern_ops source_oid:]

operators

map[description:equal family:text_pattern_ops family_slug:family-hash-text_pattern_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]

support functions

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

Source references

Full definition and evidence JSON

Definition sources

center · PostgreSQL 18 · 555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f

Text language: en · 555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f