| PostgreSQL 7.4 Documentation | ||||
|---|---|---|---|---|
| Prev | Fast Backward | Chapter 43. System Catalogs | Fast Forward | Next |
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.