pg_operator
   The catalog pg_operator stores information about operators.
   See CREATE OPERATOR
   and Section 37.14 for more information.
  
Table 51.34. pg_operator Columns
| Column Type Description | 
|---|
| 
        Row identifier | 
| 
        Name of the operator | 
| 
        The OID of the namespace that contains this operator | 
| 
        Owner of the operator | 
| 
        
        | 
| 
        This operator supports merge joins | 
| 
        This operator supports hash joins | 
| 
        Type of the left operand | 
| 
        Type of the right operand | 
| 
        Type of the result | 
| 
        Commutator of this operator, if any | 
| 
        Negator of this operator, if any | 
| 
        Function that implements this operator | 
| 
        Restriction selectivity estimation function for this operator | 
| 
        Join selectivity estimation function for this operator | 
   Unused column contain zeroes. For example, oprleft
   is zero for a prefix operator.