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61.2. Built-in Operator Classes

The core PostgreSQL distribution includes the GiST operator classes shown in Table 61-1. (Some of the optional modules described in Appendix F provide additional GiST operator classes.)

Table 61-1. Built-in GiST Operator Classes

Name Indexed Data Type Indexable Operators Ordering Operators
box_ops box && &> &< &<| >> << <<| <@ @> @ |&> |>> ~ ~=
circle_ops circle && &> &< &<| >> << <<| <@ @> @ |&> |>> ~ ~= <->
inet_ops inet, cidr && >> >>= > >= <> << <<= < <= =
point_ops point >> >^ << <@ <@ <@ <^ ~= <->
poly_ops polygon && &> &< &<| >> << <<| <@ @> @ |&> |>> ~ ~= <->
range_ops any range type && &> &< >> << <@ -|- = @> @>
tsquery_ops tsquery <@ @>
tsvector_ops tsvector @@

For historical reasons, the inet_ops operator class is not the default class for types inet and cidr. To use it, mention the class name in CREATE INDEX, for example

CREATE INDEX ON my_table USING GIST (my_inet_column inet_ops);

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https://www.postgresql.org/docs/9.6/static/gist-builtin-opclasses.html