pg_operator
The pg_operator system catalog table stores information about operators, both built-in and those defined by CREATE OPERATOR. Unused column contain zeroes. For example, oprleft is zero for a prefix operator.
| column | type | references | description |
|---|---|---|---|
oid | oid | Row identifier (hidden attribute, must be explicityly selected) | |
oprname | name | Name of the operator | |
oprnamespace | oid | pg_namespace.oid | The OID of the namespace that contains this operator |
oprowner | oid | pg_authid.oid | Owner of the operator |
oprkind | char | b = infix (both), l = prefix (left), r = postfix (right) | |
oprcanmerge | boolean | This operator supports merge joins | |
oprcanhash | boolean | 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 |
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 |