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.
| Name | Type | Reference | Description |
|---|---|---|---|
| oid | oid | - | Row identifier (hidden attribute, which must be specified). |
| amprocfamily | oid | oid in PG_OPFAMILY | Operator family of this entry. |
| amproclefttype | oid | oid in PG_TYPE | Left-hand input data type of the associated operator. For details about the possible values and their description, see Data Type. |
| amprocrighttype | oid | oid in PG_TYPE | Right-hand input data type of the associated operator. For details about the possible values and their description, see Data Type. |
| amprocnum | smallint | - | Support procedure number. |
| amproc | regproc | proname in PG_PROC | 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.
