PG_AMPROC

PG_AMPROC records information about the support procedures associated with the access method operator families. There is one row for each support procedure that belongs to an operator family.

Table 1 PG_AMPROC columns

Name

Type

Reference

Description

oid

oid

-

Row identifier (hidden attribute, which must be specified)

amprocfamily

oid

PG_OPFAMILY.oid

Operator family of this entry

amproclefttype

oid

PG_TYPE.oid

Left-hand input data type of the associated operator For details about the possible values and their description, see pg_type.h.

amprocrighttype

oid

PG_TYPE.oid

Right-hand input data type of the associated operator For details about the possible values and their description, see pg_type.h.

amprocnum

smallint

-

Support procedure number

amproc

regproc

PG_PROC

.proname

OID of the procedure

The usual interpretation of the amproclefttype and amprocrighttype columns is that they identify the left and right input types of the operator(s) that a particular support procedure supports. For some access methods, these match the input data type(s) of the support procedure itself; for others not. There is a notion of “default” support procedures for an index, which are those with amproclefttype and amprocrighttype both equal to the index opclass's opcintype.

Feedback
编组 3备份
    openGauss 2024-07-15 01:01:34
    cancel