65.2. Built-in Operator Classes
The corePostgreSQL distribution includes theSP-GiST operator classes shown inTable 65.1.
Table 65.1. Built-inSP-GiST Operator Classes
| Name | Indexed Data Type | Indexable Operators | Ordering Operators |
|---|---|---|---|
kd_point_ops | point | <<<@<^>>>^~= | <-> |
quad_point_ops | point | <<<@<^>>>^~= | <-> |
range_ops | any range type | &&&<&>-|-<<<@=>>@> | |
box_ops | box | <<&<&&&>>>~=@><@&<|<<||>>|&> | |
poly_ops | polygon | <<&<&&&>>>~=@><@&<|<<||>>|&> | <-> |
text_ops | text | <<==>>=~<=~~<~~>=~~>~^@ | |
inet_ops | inet,cidr | &&>>>>=>>=<><<<<=<<== |
Of the two operator classes for typepoint,quad_point_ops is the default.kd_point_ops supports the same operators but uses a different index data structure that may offer better performance in some applications.
Thequad_point_ops,kd_point_ops andpoly_ops operator classes support the<-> ordering operator, which enables the k-nearest neighbor (k-NN) search over indexed point or polygon data sets.