Wiki / Configuration Parameters

Controls if the query planner will produce a plan which will provide rows which are presorted in the order required for the query's ORDER BY / DISTINCT aggregate functions. When disabled, the query planner will produce a plan which will always require the executor to perform a sort before performing aggregation of each aggregate function containing an ORDER BY or DISTINCT clause. When enabled, the planner will try to produce a more efficient plan which provides input to the aggregate functions which is presorted in the order they require for aggregation. The default value is on.

English manual coverage begins with PostgreSQL 7.4. Source history and runtime observations have their own recorded version boundaries.

boot val

on

category

Query Tuning / Planner Method Configuration

context

user

documented

true

enumvals

Unknown

extra desc

Allows the query planner to build plans that provide presorted input for aggregate functions with an ORDER BY / DISTINCT clause. When disabled, implicit sorts are always performed during execution.

lang

en

max val

Unknown

metadata version

18

min val

Unknown

name

enable_presorted_aggregate

short desc

Enables the planner's ability to produce plans that provide presorted input for ORDER BY / DISTINCT aggregate functions.

source

pg-settings-source-snapshot

unit

Unknown

vartype

bool