4 The catalog pg_amproc stores information about support functions
5 associated with access method operator families. There is one row for
6 each support function belonging to an operator family.
8 Table 52.5. pg_amproc Columns
18 amprocfamily oid (references pg_opfamily.oid)
20 The operator family this entry is for
22 amproclefttype oid (references pg_type.oid)
24 Left-hand input data type of associated operator
26 amprocrighttype oid (references pg_type.oid)
28 Right-hand input data type of associated operator
32 Support function number
34 amproc regproc (references pg_proc.oid)
38 The usual interpretation of the amproclefttype and amprocrighttype
39 fields is that they identify the left and right input types of the
40 operator(s) that a particular support function supports. For some
41 access methods these match the input data type(s) of the support
42 function itself, for others not. There is a notion of “default” support
43 functions for an index, which are those with amproclefttype and
44 amprocrighttype both equal to the index operator class's opcintype.