51.34. pg_operator

51.34. `pg_operator`
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## 51.34. `pg_operator` #

The catalog `pg_operator` stores information about operators. See CREATE OPERATOR and Section 36.14 for more information.

Table 51.34. `pg_operator` Columns

Column Type Description
`oid` `oid` Row identifier
`oprname` `name` Name of the operator
`oprnamespace` `oid` (references `pg_namespace`.`oid`) The OID of the namespace that contains this operator
`oprowner` `oid` (references `pg_authid`.`oid`) Owner of the operator
`oprkind` `char` `b` = infix operator (“both”), or `l` = prefix operator (“left”)
`oprcanmerge` `bool` This operator supports merge joins
`oprcanhash` `bool` This operator supports hash joins
`oprleft` `oid` (references `pg_type`.`oid`) Type of the left operand (zero for a prefix operator)
`oprright` `oid` (references `pg_type`.`oid`) Type of the right operand
`oprresult` `oid` (references `pg_type`.`oid`) Type of the result (zero for a not-yet-defined “shell” operator)
`oprcom` `oid` (references `pg_operator`.`oid`) Commutator of this operator (zero if none)
`oprnegate` `oid` (references `pg_operator`.`oid`) Negator of this operator (zero if none)
`oprcode` `regproc` (references `pg_proc`.`oid`) Function that implements this operator (zero for a not-yet-defined “shell” operator)
`oprrest` `regproc` (references `pg_proc`.`oid`) Restriction selectivity estimation function for this operator (zero if none)
`oprjoin` `regproc` (references `pg_proc`.`oid`) Join selectivity estimation function for this operator (zero if none)

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