pg_operator

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
`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)
`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`		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.

Parent topic: System Catalogs Definitions