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/PostgreSQL 9.6

50.34. pg_operator

The catalog pg_operator stores information about operators. See CREATE OPERATOR and Section 36.12 for more information.

Table 50-34. 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.

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https://www.postgresql.org/docs/9.6/static/catalog-pg-operator.html