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
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