pg_operator
| PostgreSQL 9.4.21 Documentation | |||
|---|---|---|---|
| Prev | Up | Chapter 48. System Catalogs | Next |
The catalog pg_operator stores information about operators. See CREATE OPERATOR and Section 35.12 for more information.
Table 48-33. 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 | 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 | bool | This operator supports merge joins | |
| 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 |
| 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.