51.34. pg_operator
The catalog pg_operator stores information about operators. See CREATE OPERATOR and Section 37.12 for more information.
Table 51.34. pg_operator Columns
| Name | Type | References | Description |
|---|---|---|---|
oid | oid | Row identifier (hidden attribute; must be explicitly selected) | |
oprname | name | Name of the operator | |
oprnamespace | oid | | The OID of the namespace that contains this operator |
oprowner | oid | | Owner of the operator |
oprkind | char | b = infix (“both”), l = prefix (“left”), r = postfix (“right”) | |
oprcanmerge | bool | This operator supports merge joins | |
oprcanhash | bool | This operator supports hash joins | |
oprleft | oid | | Type of the left operand |
oprright | oid | | Type of the right operand |
oprresult | oid | | Type of the result |
oprcom | oid | | Commutator of this operator, if any |
oprnegate | oid | | Negator of this operator, if any |
oprcode | regproc | | Function that implements this operator |
oprrest | regproc | | Restriction selectivity estimation function for this operator |
oprjoin | regproc | | Join selectivity estimation function for this operator |
Unused columns contain zeroes. For example, oprleft is zero for a prefix operator.