pg_amprocThe catalog pg_amproc stores information about support functions associated with access method operator families. There is one row for each support function belonging to an operator family.
Table 51.5. pg_amproc Columns
|
Column Type Description |
|---|
|
Row identifier |
|
The operator family this entry is for |
|
Left-hand input data type of associated operator |
|
Right-hand input data type of associated operator |
|
Support function number |
|
OID of the function |
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 function supports. For some access methods these match the input data type(s) of the support function itself, for others not. There is a notion of “default” support functions for an index, which are those with amproclefttype and amprocrighttype both equal to the index operator class's opcintype.
Read the upstream documentation. For corrections, first check the current version.