51.5. pg_amproc

51.5. `pg_amproc`
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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 51.5. pg_amproc Columns

Column Type Description
`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

Column Type

Description

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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51.4. `pg_amop`	Home	51.6. `pg_attrdef`