51.34. pg_operator

The catalog pg_operator stores information about operators. See CREATE OPERATOR and Section 37.12 for more information.

Table 51.34. 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.