gist/poly_ops (class)

GiST operator class for polygon; member of poly_ops.

Reading PostgreSQL 18.6.

Description

GiST operator class for polygon; member of poly_ops.

Object kind: Operator class
Index AM: GiST
Input type: polygon
Stored key type: box
Default class: yes

Usage

gist/poly_ops

Operator classes and families

An index definition can specify an operator class for each column of an index.

The operator class identifies the operators to be used by the index for that column. For example, a B-tree index on the type int4 would use the int4_ops class; this operator class includes comparison functions for values of type int4 . In practice the default operator class for the column's data type is usually sufficient. The main reason for having operator classes is that for some data types, there could be more than one meaningful index behavior. For example, we might want to sort a complex-number data type either by absolute value or by real part. We could do this by defining two operator classes for the data type and then selecting the proper class when making an index. The operator class determines the basic sort ordering (which can then be modified by adding sort options COLLATE , ASC / DESC and/or NULLS FIRST / NULLS LAST ).

There are also some built-in operator classes besides the default ones:

Family operator strategies

Operator overload	Strategy	Purpose	Ordering family	Membership scope	Source description
<<(polygon,polygon)	1	search		Class input pair	is left of
&<(polygon,polygon)	2	search		Class input pair	overlaps or is left of
&&(polygon,polygon)	3	search		Class input pair	overlaps
&>(polygon,polygon)	4	search		Class input pair	overlaps or is right of
>>(polygon,polygon)	5	search		Class input pair	is right of
~=(polygon,polygon)	6	search		Class input pair	same as
@>(polygon,polygon)	7	search		Class input pair	contains
<@(polygon,polygon)	8	search		Class input pair	is contained by
&<\|(polygon,polygon)	9	search		Class input pair	overlaps or is below
<<\|(polygon,polygon)	10	search		Class input pair	is below
\|>>(polygon,polygon)	11	search		Class input pair	is above
\|&>(polygon,polygon)	12	search		Class input pair	overlaps or is above
<->(polygon,point)	15	ordering	float_ops	Family member	distance between

Family support functions

Support number	Left type	Right type	Function signature	Result type
1	polygon	polygon	gist_poly_consistent(internal,polygon,int2,oid,internal)	bool
2	polygon	polygon	gist_box_union(internal,internal)	box
3	polygon	polygon	gist_poly_compress(internal)	internal
5	polygon	polygon	gist_box_penalty(internal,internal,internal)	internal
6	polygon	polygon	gist_box_picksplit(internal,internal)	internal
7	polygon	polygon	gist_box_same(box,box,internal)	internal
8	polygon	polygon	gist_poly_distance(internal,polygon,int2,oid,internal)	float8
12	any	any	gist_translate_cmptype_common(int4)	int2

Classes in this family

Class	Input type	Key type	Default
poly_ops	polygon	box	yes

Related entries

Documentation and source

Source build

Version: 18.6
Build: https://ftp.postgresql.org/pub/source/v18.6/postgresql-18.6.tar.bz2
Source fingerprint: 555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f

Compare versions

PostgreSQL 13 → 14: changed.

--- PostgreSQL 13
+++ PostgreSQL 14
@@ -73,26 +73,6 @@
       "family": "poly_ops",
       "left_type": "polygon",
       "method": "gist",
-      "operator": "~(polygon,polygon)",
-      "purpose": "search",
-      "right_type": "polygon",
-      "sort_family": "",
-      "strategy": "13"
-    },
-    {
-      "family": "poly_ops",
-      "left_type": "polygon",
-      "method": "gist",
-      "operator": "@(polygon,polygon)",
-      "purpose": "search",
-      "right_type": "polygon",
-      "sort_family": "",
-      "strategy": "14"
-    },
-    {
-      "family": "poly_ops",
-      "left_type": "polygon",
-      "method": "gist",
       "operator": "&<(polygon,polygon)",
       "purpose": "search",
       "right_type": "polygon",

Compares recorded interfaces and attributes. Source fingerprints and build metadata are excluded; an absent sample is not proof of the introduction or removal release.

Related entries

Export JSON · Back to Operator Families · Recorded in PostgreSQL 10 through 20; the first sample is not necessarily its introduction.