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luhuayi 177cd61a57 DWS DEVG 910.211 version 
Reviewed-by: Pruthi, Vineet <vineet.pruthi@t-systems.com>
Co-authored-by: luhuayi <luhuayi@huawei.com>
Co-committed-by: luhuayi <luhuayi@huawei.com>
2025-05-05 07:44:03 +00:00

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PG_AGGREGATE

pg_aggregate records information about aggregation functions. Each entry in pg_aggregate is an extension of an entry in pg_proc. The pg_proc entry carries the aggregate's name, input and output data types, and other information that is similar to ordinary functions.

Table 1 PG_AGGREGATE columns

Column

Type

Reference

Description

aggfnoid

regproc

PG_PROC.oid

PG_PROC OID of the aggregate function.

aggtransfn

regproc

PG_PROC.oid

Transition function.

aggcollectfn

regproc

PG_PROC.oid

Aggregate function.

aggfinalfn

regproc

PG_PROC.oid

Final function (zero if none).

aggsortop

OID

PG_OPERATOR.oid

Associated sort operator (zero if none).

aggtranstype

OID

PG_TYPE.oid

Data type of the aggregate function's internal transition (state) data.

agginitval

Text

-

Initial value of the transition state. This is a text column containing the initial value in its external string representation. If this column is null, the transition state value starts out null.

agginitcollect

Text

-

Initial value of the collection state. This is a text column containing the initial value in its external string representation. If this column is null, the collection state value starts out null.
Parent topic: System Catalogs