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
oid	oid		Row identifier (hidden attribute; must be explicitly selected)
amprocfamily	oid	pg_opfamily.oid	The operator family this entry is for
amproclefttype	oid	pg_type.oid	Left-hand input data type of associated operator
amprocrighttype	oid	pg_type.oid	Right-hand input data type of associated operator
amprocnum	smallint		Support procedure number
amproc	regproc	pg_proc.oid	OID of the procedure