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 |
Parent topic: System Catalogs Definitions