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.
