65.2. Built-in Operator Classes
The core PostgreSQL distribution includes the SP-GiST operator classes shown in Table 65.1.
Table 65.1. Built-in SP-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 type point, 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.
The quad_point_ops, kd_point_ops and poly_ops operator classes support the <-> ordering operator, which enables the k-nearest neighbor (k-NN) search over indexed point or polygon data sets.