pg_amproc

The pg_amproc table stores information about support procedures associated with index access method operator classes. There is one row for each support procedure belonging to an operator class.

Table 1. pg_catalog.pg_amproc

column	type	references	description
amopclaid	oid	pg_opclass.oid	The index operator class this entry is for
amprocsubtype	oid	pg_type.oid	Subtype, if cross-type routine, else zero
amprocnum	int2		Support procedure number
amproc	regproc	pg_proc.oid	OID of the procedure