Lu, Huayi
a24ca60074
Reviewed-by: Hasko, Vladimir <vladimir.hasko@t-systems.com> Co-authored-by: Lu, Huayi <luhuayi@huawei.com> Co-committed-by: Lu, Huayi <luhuayi@huawei.com>
7.5 KiB
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 belonging to an operator family.
Name |
Type |
Reference |
Description |
|---|---|---|---|
oid |
oid |
- |
Row identifier (hidden attribute; must be explicitly selected) |
amprocfamily |
oid |
PG_OPFAMILY.oid |
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 |
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.