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.

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

Parent topic: System Catalogs Definitions

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