69.2. 内置操作符类 #
PostgreSQL 核心发行版包含了 SP-GiST 操作符类，如表 69.1 所示。
表 69.1. 内置 SP-GiST 操作符类
| 名称 | 可索引操作符 | 排序操作符 |
|---|---|---|
box_ops | << (box,box) | <-> (box,point) |
&< (box,box) | ||
&> (box,box) | ||
>> (box,box) | ||
<@ (box,box) | ||
@> (box,box) | ||
~= (box,box) | ||
&& (box,box) | ||
<<| (box,box) | ||
&<| (box,box) | ||
|&> (box,box) | ||
|>> (box,box) | ||
inet_ops | << (inet,inet) | |
<<= (inet,inet) | ||
>> (inet,inet) | ||
>>= (inet,inet) | ||
= (inet,inet) | ||
<> (inet,inet) | ||
< (inet,inet) | ||
<= (inet,inet) | ||
> (inet,inet) | ||
>= (inet,inet) | ||
&& (inet,inet) | ||
kd_point_ops | |>> (point,point) | <-> (point,point) |
<< (point,point) | ||
>> (point,point) | ||
<<| (point,point) | ||
~= (point,point) | ||
<@ (point,box) | ||
poly_ops | << (polygon,polygon) | <-> (polygon,point) |
&< (polygon,polygon) | ||
&> (polygon,polygon) | ||
>> (polygon,polygon) | ||
<@ (polygon,polygon) | ||
@> (polygon,polygon) | ||
~= (polygon,polygon) | ||
&& (polygon,polygon) | ||
<<| (polygon,polygon) | ||
&<| (polygon,polygon) | ||
|>> (polygon,polygon) | ||
|&> (polygon,polygon) | ||
quad_point_ops | |>> (point,point) | <-> (point,point) |
<< (point,point) | ||
>> (point,point) | ||
<<| (point,point) | ||
~= (point,point) | ||
<@ (point,box) | ||
range_ops | = (anyrange,anyrange) | |
&& (anyrange,anyrange) | ||
@> (anyrange,anyelement) | ||
@> (anyrange,anyrange) | ||
<@ (anyrange,anyrange) | ||
<< (anyrange,anyrange) | ||
>> (anyrange,anyrange) | ||
&< (anyrange,anyrange) | ||
&> (anyrange,anyrange) | ||
-|- (anyrange,anyrange) | ||
text_ops | = (text,text) | |
< (text,text) | ||
<= (text,text) | ||
> (text,text) | ||
>= (text,text) | ||
~<~ (text,text) | ||
~<=~ (text,text) | ||
~>=~ (text,text) | ||
~>~ (text,text) | ||
^@ (text,text) |
对于类型 point 的两个操作符类，quad_point_ops 是默认选项。kd_point_ops 支持相同的操作符，但使用不同的索引数据结构，在某些应用中可能提供更好的性能。
quad_point_ops、kd_point_ops 和
poly_ops 操作符类支持 <->
排序操作符，这使得可以在已建立索引的点或多边形数据集上执行 k 最近邻（k-NN）搜索。
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