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44.4. pg_amop

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
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.