The catalog pg_amop stores information about operators associated with access method operator families. There is one row for each operator that is a member of an operator family. An operator can appear in more than one family, but cannot appear in more than one position within a family.
Table 44-4. pg_amop Columns
| Name | Type | References | Description |
|---|---|---|---|
| amopfamily | oid | pg_opfamily.oid | The operator family this entry is for |
| amoplefttype | oid | pg_type.oid | Left-hand input data type of operator |
| amoprighttype | oid | pg_type.oid | Right-hand input data type of operator |
| amopstrategy | int2 | Operator strategy number | |
| amopreqcheck | bool | Index hit must be rechecked | |
| amopopr | oid | pg_operator.oid | OID of the operator |
| amopmethod | oid | pg_am.oid | Index access method operator family is for |
An entry's amopmethod must match the opfmethod of its containing operator family (including amopmethod here is an intentional denormalization of the catalog structure for performance reasons). Also, amoplefttype and amoprighttype must match the oprleft and oprright fields of the referenced pg_operator entry.