Supported Versions: Current (16) / 15 / 14 / 13 / 12
Development Versions: 17 / devel
Unsupported versions: 11 / 10 / 9.6 / 9.5 / 9.4 / 9.3 / 9.2 / 9.1 / 9.0 / 8.4 / 8.3 / 8.2 / 8.1 / 8.0 / 7.4 / 7.3

53.5. pg_amproc #

The 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 53.5. pg_amproc Columns

Column Type


oid oid

Row identifier

amprocfamily oid (references pg_opfamily.oid)

The operator family this entry is for

amproclefttype oid (references pg_type.oid)

Left-hand input data type of associated operator

amprocrighttype oid (references pg_type.oid)

Right-hand input data type of associated operator

amprocnum int2

Support function number

amproc regproc (references pg_proc.oid)

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.

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