PostgreSQL 7.4 Documentation
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# 43.23. `pg_operator`

The catalog `pg_operator` stores information about operators. See `CREATE OPERATOR` and Section 33.11 for details on these operator parameters.

Table 43-23. `pg_operator` Columns

Name | Type | References | Description
--- | --- | --- | ---
`oprname` | `name` |  | Name of the operator
`oprnamespace` | `oid` | `pg_namespace`.oid | The OID of the namespace that contains this operator
`oprowner` | `int4` | `pg_shadow`.usesysid | Owner of the operator
`oprkind` | `char` |  | b = infix ("both"), l = prefix ("left"), r = postfix ("right")
`oprcanhash` | `bool` |  | This operator supports hash joins
`oprleft` | `oid` | `pg_type`.oid | Type of the left operand
`oprright` | `oid` | `pg_type`.oid | Type of the right operand
`oprresult` | `oid` | `pg_type`.oid | Type of the result
`oprcom` | `oid` | `pg_operator`.oid | Commutator of this operator, if any
`oprnegate` | `oid` | `pg_operator`.oid | Negator of this operator, if any
`oprlsortop` | `oid` | `pg_operator`.oid | If this operator supports merge joins, the operator that sorts the type of the left-hand operand (L<L)
`oprrsortop` | `oid` | `pg_operator`.oid | If this operator supports merge joins, the operator that sorts the type of the right-hand operand (R<R)
`oprltcmpop` | `oid` | `pg_operator`.oid | If this operator supports merge joins, the less-than operator that compares the left and right operand types (L<R)
`oprgtcmpop` | `oid` | `pg_operator`.oid | If this operator supports merge joins, the greater-than operator that compares the left and right operand types (L>R)
`oprcode` | `regproc` | `pg_proc`.oid | Function that implements this operator
`oprrest` | `regproc` | `pg_proc`.oid | Restriction selectivity estimation function for this operator
`oprjoin` | `regproc` | `pg_proc`.oid | Join selectivity estimation function for this operator

Unused column contain zeroes, for example `oprleft` is zero for a prefix operator.

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`pg_opclass` | Up | `pg_proc`