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.

Table 1. pg_catalog.pg_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 I oid pg_operator.oid f 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.