51.5. pg_amproc
The catalog
pg_amproc
stores information about
support procedures associated with access method operator families. There
is one row for each support procedure belonging to an operator family.
Table 51.5.
pg_amproc
Columns
| Name | Type | References | Description |
|---|---|---|---|
oid
|
oid
|
Row identifier (hidden attribute; must be explicitly selected) | |
amprocfamily
|
oid
|
|
The operator family this entry is for |
amproclefttype
|
oid
|
|
Left-hand input data type of associated operator |
amprocrighttype
|
oid
|
|
Right-hand input data type of associated operator |
amprocnum
|
int2
|
Support procedure number | |
amproc
|
regproc
|
|
OID of the procedure |
The usual interpretation of the
amproclefttype
and
amprocrighttype
fields
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 operator class's
opcintype
.