count_distinct

An alternative to COUNT(DISTINCT …) aggregate, usable with HashAggregate

Overview

ID	Extension	Package	Version	Category	License	Language
4630	count_distinct	count_distinct	`3.0.2`	FUNC	BSD 2-Clause	C

Attribute	Has Binary	Has Library	Need Load	Has DDL	Relocatable	Trusted
--s-d-r	No	Yes	No	Yes	yes	no

Relationships
See Also	topn hll omnisketch ddsketch quantile lower_quantile first_last_agg aggs_for_arrays

no pg14,13,12 on el8/9 pgdg

Packages

Type	Repo	Version	PG Major Availability	Package Pattern	Dependencies
EL	PIGSTY	`3.0.2`	18 17 16 15 14 13	`count_distinct_$v*`	-
Debian	PIGSTY	`3.0.2`	18 17 16 15 14 13	`postgresql-$v-count-distinct`	-

Linux / PG	PG18	PG17	PG16	PG15	PG14	PG13
el8.x86_64	PIGSTY 3.0.2	PIGSTY 3.0.2	PIGSTY 3.0.2	PIGSTY 3.0.2	PIGSTY 3.0.2	PIGSTY 3.0.2
el8.aarch64	PIGSTY 3.0.2	PIGSTY 3.0.2	PIGSTY 3.0.2	PIGSTY 3.0.2	PIGSTY 3.0.2	PIGSTY 3.0.2
el9.x86_64	PIGSTY 3.0.2	PIGSTY 3.0.2	PIGSTY 3.0.2	PIGSTY 3.0.2	PIGSTY 3.0.2	PIGSTY 3.0.2
el9.aarch64	PIGSTY 3.0.2	PIGSTY 3.0.2	PIGSTY 3.0.2	PIGSTY 3.0.2	PIGSTY 3.0.2	PIGSTY 3.0.2
el10.x86_64	PIGSTY 3.0.2	PIGSTY 3.0.2	PIGSTY 3.0.2	PIGSTY 3.0.2	PIGSTY 3.0.2	PIGSTY 3.0.2
el10.aarch64	PIGSTY 3.0.2	PIGSTY 3.0.2	PIGSTY 3.0.2	PIGSTY 3.0.2	PIGSTY 3.0.2	PIGSTY 3.0.2
d12.x86_64	MISS	PIGSTY 3.0.2	PIGSTY 3.0.2	PIGSTY 3.0.2	PIGSTY 3.0.2	PIGSTY 3.0.2
d12.aarch64	MISS	PIGSTY 3.0.2	PIGSTY 3.0.2	PIGSTY 3.0.2	PIGSTY 3.0.2	PIGSTY 3.0.2
d13.x86_64	MISS	MISS	MISS	MISS	MISS	MISS
d13.aarch64	MISS	MISS	MISS	MISS	MISS	MISS
u22.x86_64	MISS	PIGSTY 3.0.2	PIGSTY 3.0.2	PIGSTY 3.0.2	PIGSTY 3.0.2	PIGSTY 3.0.2
u22.aarch64	MISS	PIGSTY 3.0.2	PIGSTY 3.0.2	PIGSTY 3.0.2	PIGSTY 3.0.2	PIGSTY 3.0.2
u24.x86_64	MISS	PIGSTY 3.0.2	PIGSTY 3.0.2	PIGSTY 3.0.2	PIGSTY 3.0.2	PIGSTY 3.0.2
u24.aarch64	MISS	PIGSTY 3.0.2	PIGSTY 3.0.2	PIGSTY 3.0.2	PIGSTY 3.0.2	PIGSTY 3.0.2

Package	Version	OS	ORG	SIZE	File URL
`count_distinct_18`	3.0.2	`el8.x86_64`	pigsty	16.8 KiB	count_distinct_18-3.0.2-1PIGSTY.el8.x86_64.rpm
`count_distinct_18`	3.0.2	`el8.x86_64`	pgdg	23.1 KiB	count_distinct_18-3.0.2-1PGDG.rhel8.x86_64.rpm
`count_distinct_18`	3.0.2	`el8.aarch64`	pigsty	16.6 KiB	count_distinct_18-3.0.2-1PIGSTY.el8.aarch64.rpm
`count_distinct_18`	3.0.2	`el8.aarch64`	pgdg	22.8 KiB	count_distinct_18-3.0.2-1PGDG.rhel8.aarch64.rpm
`count_distinct_18`	3.0.2	`el9.x86_64`	pigsty	16.6 KiB	count_distinct_18-3.0.2-1PIGSTY.el9.x86_64.rpm
`count_distinct_18`	3.0.2	`el9.x86_64`	pgdg	22.9 KiB	count_distinct_18-3.0.2-1PGDG.rhel9.x86_64.rpm
`count_distinct_18`	3.0.2	`el9.aarch64`	pigsty	16.5 KiB	count_distinct_18-3.0.2-1PIGSTY.el9.aarch64.rpm
`count_distinct_18`	3.0.2	`el9.aarch64`	pgdg	22.3 KiB	count_distinct_18-3.0.2-1PGDG.rhel9.aarch64.rpm
`count_distinct_18`	3.0.2	`el10.x86_64`	pigsty	16.7 KiB	count_distinct_18-3.0.2-1PIGSTY.el10.x86_64.rpm
`count_distinct_18`	3.0.2	`el10.x86_64`	pgdg	23.3 KiB	count_distinct_18-3.0.2-1PGDG.rhel10.x86_64.rpm
`count_distinct_18`	3.0.2	`el10.aarch64`	pigsty	16.6 KiB	count_distinct_18-3.0.2-1PIGSTY.el10.aarch64.rpm
`count_distinct_18`	3.0.2	`el10.aarch64`	pgdg	22.9 KiB	count_distinct_18-3.0.2-1PGDG.rhel10.aarch64.rpm

Package	Version	OS	ORG	SIZE	File URL
`count_distinct_17`	3.0.2	`el8.x86_64`	pigsty	16.8 KiB	count_distinct_17-3.0.2-1PIGSTY.el8.x86_64.rpm
`count_distinct_17`	3.0.1	`el8.x86_64`	pgdg	20.7 KiB	count_distinct_17-3.0.1-6PGDG.rhel8.x86_64.rpm
`count_distinct_17`	3.0.2	`el8.aarch64`	pigsty	16.6 KiB	count_distinct_17-3.0.2-1PIGSTY.el8.aarch64.rpm
`count_distinct_17`	3.0.1	`el8.aarch64`	pgdg	20.4 KiB	count_distinct_17-3.0.1-6PGDG.rhel8.aarch64.rpm
`count_distinct_17`	3.0.2	`el9.x86_64`	pigsty	16.6 KiB	count_distinct_17-3.0.2-1PIGSTY.el9.x86_64.rpm
`count_distinct_17`	3.0.1	`el9.x86_64`	pgdg	20.6 KiB	count_distinct_17-3.0.1-6PGDG.rhel9.x86_64.rpm
`count_distinct_17`	3.0.2	`el9.aarch64`	pigsty	16.5 KiB	count_distinct_17-3.0.2-1PIGSTY.el9.aarch64.rpm
`count_distinct_17`	3.0.1	`el9.aarch64`	pgdg	20.2 KiB	count_distinct_17-3.0.1-6PGDG.rhel9.aarch64.rpm
`count_distinct_17`	3.0.2	`el10.x86_64`	pigsty	16.7 KiB	count_distinct_17-3.0.2-1PIGSTY.el10.x86_64.rpm
`count_distinct_17`	3.0.2	`el10.x86_64`	pgdg	23.3 KiB	count_distinct_17-3.0.2-1PGDG.rhel10.x86_64.rpm
`count_distinct_17`	3.0.2	`el10.aarch64`	pigsty	16.6 KiB	count_distinct_17-3.0.2-1PIGSTY.el10.aarch64.rpm
`count_distinct_17`	3.0.2	`el10.aarch64`	pgdg	22.9 KiB	count_distinct_17-3.0.2-1PGDG.rhel10.aarch64.rpm
`postgresql-17-count-distinct`	3.0.2	`d12.x86_64`	pigsty	35.5 KiB	postgresql-17-count-distinct_3.0.2-1PIGSTY~bookworm_amd64.deb
`postgresql-17-count-distinct`	3.0.2	`d12.aarch64`	pigsty	35.3 KiB	postgresql-17-count-distinct_3.0.2-1PIGSTY~bookworm_arm64.deb
`postgresql-17-count-distinct`	3.0.2	`u22.x86_64`	pigsty	37.4 KiB	postgresql-17-count-distinct_3.0.2-1PIGSTY~jammy_amd64.deb
`postgresql-17-count-distinct`	3.0.2	`u22.aarch64`	pigsty	37.3 KiB	postgresql-17-count-distinct_3.0.2-1PIGSTY~jammy_arm64.deb
`postgresql-17-count-distinct`	3.0.2	`u24.x86_64`	pigsty	35.8 KiB	postgresql-17-count-distinct_3.0.2-1PIGSTY~noble_amd64.deb
`postgresql-17-count-distinct`	3.0.2	`u24.aarch64`	pigsty	35.5 KiB	postgresql-17-count-distinct_3.0.2-1PIGSTY~noble_arm64.deb

Package	Version	OS	ORG	SIZE	File URL
`count_distinct_16`	3.0.2	`el8.x86_64`	pigsty	16.8 KiB	count_distinct_16-3.0.2-1PIGSTY.el8.x86_64.rpm
`count_distinct_16`	3.0.1	`el8.x86_64`	pgdg	20.6 KiB	count_distinct_16-3.0.1-5PGDG.rhel8.x86_64.rpm
`count_distinct_16`	3.0.2	`el8.aarch64`	pigsty	16.6 KiB	count_distinct_16-3.0.2-1PIGSTY.el8.aarch64.rpm
`count_distinct_16`	3.0.1	`el8.aarch64`	pgdg	20.3 KiB	count_distinct_16-3.0.1-5PGDG.rhel8.aarch64.rpm
`count_distinct_16`	3.0.2	`el9.x86_64`	pigsty	16.6 KiB	count_distinct_16-3.0.2-1PIGSTY.el9.x86_64.rpm
`count_distinct_16`	3.0.1	`el9.x86_64`	pgdg	20.4 KiB	count_distinct_16-3.0.1-5PGDG.rhel9.x86_64.rpm
`count_distinct_16`	3.0.2	`el9.aarch64`	pigsty	16.5 KiB	count_distinct_16-3.0.2-1PIGSTY.el9.aarch64.rpm
`count_distinct_16`	3.0.1	`el9.aarch64`	pgdg	19.8 KiB	count_distinct_16-3.0.1-5PGDG.rhel9.aarch64.rpm
`count_distinct_16`	3.0.2	`el10.x86_64`	pigsty	16.7 KiB	count_distinct_16-3.0.2-1PIGSTY.el10.x86_64.rpm
`count_distinct_16`	3.0.2	`el10.x86_64`	pgdg	23.3 KiB	count_distinct_16-3.0.2-1PGDG.rhel10.x86_64.rpm
`count_distinct_16`	3.0.2	`el10.aarch64`	pigsty	16.6 KiB	count_distinct_16-3.0.2-1PIGSTY.el10.aarch64.rpm
`count_distinct_16`	3.0.2	`el10.aarch64`	pgdg	22.9 KiB	count_distinct_16-3.0.2-1PGDG.rhel10.aarch64.rpm
`postgresql-16-count-distinct`	3.0.2	`d12.x86_64`	pigsty	35.5 KiB	postgresql-16-count-distinct_3.0.2-1PIGSTY~bookworm_amd64.deb
`postgresql-16-count-distinct`	3.0.2	`d12.aarch64`	pigsty	35.3 KiB	postgresql-16-count-distinct_3.0.2-1PIGSTY~bookworm_arm64.deb
`postgresql-16-count-distinct`	3.0.2	`u22.x86_64`	pigsty	37.4 KiB	postgresql-16-count-distinct_3.0.2-1PIGSTY~jammy_amd64.deb
`postgresql-16-count-distinct`	3.0.2	`u22.aarch64`	pigsty	37.3 KiB	postgresql-16-count-distinct_3.0.2-1PIGSTY~jammy_arm64.deb
`postgresql-16-count-distinct`	3.0.2	`u24.x86_64`	pigsty	35.8 KiB	postgresql-16-count-distinct_3.0.2-1PIGSTY~noble_amd64.deb
`postgresql-16-count-distinct`	3.0.2	`u24.aarch64`	pigsty	35.5 KiB	postgresql-16-count-distinct_3.0.2-1PIGSTY~noble_arm64.deb

Package	Version	OS	ORG	SIZE	File URL
`count_distinct_15`	3.0.2	`el8.x86_64`	pigsty	16.7 KiB	count_distinct_15-3.0.2-1PIGSTY.el8.x86_64.rpm
`count_distinct_15`	3.0.1	`el8.x86_64`	pgdg	31.7 KiB	count_distinct_15-3.0.1-3.rhel8.x86_64.rpm
`count_distinct_15`	3.0.2	`el8.aarch64`	pigsty	16.6 KiB	count_distinct_15-3.0.2-1PIGSTY.el8.aarch64.rpm
`count_distinct_15`	3.0.1	`el8.aarch64`	pgdg	31.2 KiB	count_distinct_15-3.0.1-3.rhel8.aarch64.rpm
`count_distinct_15`	3.0.2	`el9.x86_64`	pigsty	16.7 KiB	count_distinct_15-3.0.2-1PIGSTY.el9.x86_64.rpm
`count_distinct_15`	3.0.1	`el9.x86_64`	pgdg	32.4 KiB	count_distinct_15-3.0.1-3.rhel9.x86_64.rpm
`count_distinct_15`	3.0.2	`el9.aarch64`	pigsty	16.4 KiB	count_distinct_15-3.0.2-1PIGSTY.el9.aarch64.rpm
`count_distinct_15`	3.0.1	`el9.aarch64`	pgdg	31.6 KiB	count_distinct_15-3.0.1-3.rhel9.aarch64.rpm
`count_distinct_15`	3.0.2	`el10.x86_64`	pigsty	16.6 KiB	count_distinct_15-3.0.2-1PIGSTY.el10.x86_64.rpm
`count_distinct_15`	3.0.2	`el10.x86_64`	pgdg	23.2 KiB	count_distinct_15-3.0.2-1PGDG.rhel10.x86_64.rpm
`count_distinct_15`	3.0.2	`el10.aarch64`	pigsty	16.6 KiB	count_distinct_15-3.0.2-1PIGSTY.el10.aarch64.rpm
`count_distinct_15`	3.0.2	`el10.aarch64`	pgdg	22.9 KiB	count_distinct_15-3.0.2-1PGDG.rhel10.aarch64.rpm
`postgresql-15-count-distinct`	3.0.2	`d12.x86_64`	pigsty	35.3 KiB	postgresql-15-count-distinct_3.0.2-1PIGSTY~bookworm_amd64.deb
`postgresql-15-count-distinct`	3.0.2	`d12.aarch64`	pigsty	35.1 KiB	postgresql-15-count-distinct_3.0.2-1PIGSTY~bookworm_arm64.deb
`postgresql-15-count-distinct`	3.0.2	`u22.x86_64`	pigsty	37.1 KiB	postgresql-15-count-distinct_3.0.2-1PIGSTY~jammy_amd64.deb
`postgresql-15-count-distinct`	3.0.2	`u22.aarch64`	pigsty	37.1 KiB	postgresql-15-count-distinct_3.0.2-1PIGSTY~jammy_arm64.deb
`postgresql-15-count-distinct`	3.0.2	`u24.x86_64`	pigsty	35.6 KiB	postgresql-15-count-distinct_3.0.2-1PIGSTY~noble_amd64.deb
`postgresql-15-count-distinct`	3.0.2	`u24.aarch64`	pigsty	35.4 KiB	postgresql-15-count-distinct_3.0.2-1PIGSTY~noble_arm64.deb

Package	Version	OS	ORG	SIZE	File URL
`count_distinct_14`	3.0.2	`el8.x86_64`	pigsty	16.7 KiB	count_distinct_14-3.0.2-1PIGSTY.el8.x86_64.rpm
`count_distinct_14`	3.0.1	`el8.x86_64`	pgdg	32.1 KiB	count_distinct_14-3.0.1-3.rhel8.x86_64.rpm
`count_distinct_14`	3.0.2	`el8.aarch64`	pigsty	16.6 KiB	count_distinct_14-3.0.2-1PIGSTY.el8.aarch64.rpm
`count_distinct_14`	3.0.1	`el8.aarch64`	pgdg	31.1 KiB	count_distinct_14-3.0.1-3.rhel8.aarch64.rpm
`count_distinct_14`	3.0.2	`el9.x86_64`	pigsty	16.6 KiB	count_distinct_14-3.0.2-1PIGSTY.el9.x86_64.rpm
`count_distinct_14`	3.0.2	`el9.aarch64`	pigsty	16.4 KiB	count_distinct_14-3.0.2-1PIGSTY.el9.aarch64.rpm
`count_distinct_14`	3.0.1	`el9.aarch64`	pgdg	31.7 KiB	count_distinct_14-3.0.1-3.rhel9.aarch64.rpm
`count_distinct_14`	3.0.2	`el10.x86_64`	pigsty	16.6 KiB	count_distinct_14-3.0.2-1PIGSTY.el10.x86_64.rpm
`count_distinct_14`	3.0.2	`el10.x86_64`	pgdg	23.2 KiB	count_distinct_14-3.0.2-1PGDG.rhel10.x86_64.rpm
`count_distinct_14`	3.0.2	`el10.aarch64`	pigsty	16.5 KiB	count_distinct_14-3.0.2-1PIGSTY.el10.aarch64.rpm
`count_distinct_14`	3.0.2	`el10.aarch64`	pgdg	22.9 KiB	count_distinct_14-3.0.2-1PGDG.rhel10.aarch64.rpm
`postgresql-14-count-distinct`	3.0.2	`d12.x86_64`	pigsty	35.3 KiB	postgresql-14-count-distinct_3.0.2-1PIGSTY~bookworm_amd64.deb
`postgresql-14-count-distinct`	3.0.2	`d12.aarch64`	pigsty	35.1 KiB	postgresql-14-count-distinct_3.0.2-1PIGSTY~bookworm_arm64.deb
`postgresql-14-count-distinct`	3.0.2	`u22.x86_64`	pigsty	37.1 KiB	postgresql-14-count-distinct_3.0.2-1PIGSTY~jammy_amd64.deb
`postgresql-14-count-distinct`	3.0.2	`u22.aarch64`	pigsty	37.0 KiB	postgresql-14-count-distinct_3.0.2-1PIGSTY~jammy_arm64.deb
`postgresql-14-count-distinct`	3.0.2	`u24.x86_64`	pigsty	35.5 KiB	postgresql-14-count-distinct_3.0.2-1PIGSTY~noble_amd64.deb
`postgresql-14-count-distinct`	3.0.2	`u24.aarch64`	pigsty	35.4 KiB	postgresql-14-count-distinct_3.0.2-1PIGSTY~noble_arm64.deb

Package	Version	OS	ORG	SIZE	File URL
`count_distinct_13`	3.0.2	`el8.x86_64`	pigsty	16.6 KiB	count_distinct_13-3.0.2-1PIGSTY.el8.x86_64.rpm
`count_distinct_13`	3.0.2	`el8.aarch64`	pigsty	16.6 KiB	count_distinct_13-3.0.2-1PIGSTY.el8.aarch64.rpm
`count_distinct_13`	3.0.1	`el8.aarch64`	pgdg	31.1 KiB	count_distinct_13-3.0.1-3.rhel8.aarch64.rpm
`count_distinct_13`	3.0.2	`el9.x86_64`	pigsty	16.6 KiB	count_distinct_13-3.0.2-1PIGSTY.el9.x86_64.rpm
`count_distinct_13`	3.0.2	`el9.aarch64`	pigsty	16.5 KiB	count_distinct_13-3.0.2-1PIGSTY.el9.aarch64.rpm
`count_distinct_13`	3.0.1	`el9.aarch64`	pgdg	31.7 KiB	count_distinct_13-3.0.1-3.rhel9.aarch64.rpm
`count_distinct_13`	3.0.2	`el10.x86_64`	pigsty	16.6 KiB	count_distinct_13-3.0.2-1PIGSTY.el10.x86_64.rpm
`count_distinct_13`	3.0.2	`el10.x86_64`	pgdg	23.2 KiB	count_distinct_13-3.0.2-1PGDG.rhel10.x86_64.rpm
`count_distinct_13`	3.0.2	`el10.aarch64`	pigsty	16.5 KiB	count_distinct_13-3.0.2-1PIGSTY.el10.aarch64.rpm
`count_distinct_13`	3.0.2	`el10.aarch64`	pgdg	22.9 KiB	count_distinct_13-3.0.2-1PGDG.rhel10.aarch64.rpm
`postgresql-13-count-distinct`	3.0.2	`d12.x86_64`	pigsty	35.2 KiB	postgresql-13-count-distinct_3.0.2-1PIGSTY~bookworm_amd64.deb
`postgresql-13-count-distinct`	3.0.2	`d12.aarch64`	pigsty	34.9 KiB	postgresql-13-count-distinct_3.0.2-1PIGSTY~bookworm_arm64.deb
`postgresql-13-count-distinct`	3.0.2	`u22.x86_64`	pigsty	37.1 KiB	postgresql-13-count-distinct_3.0.2-1PIGSTY~jammy_amd64.deb
`postgresql-13-count-distinct`	3.0.2	`u22.aarch64`	pigsty	36.8 KiB	postgresql-13-count-distinct_3.0.2-1PIGSTY~jammy_arm64.deb
`postgresql-13-count-distinct`	3.0.2	`u24.x86_64`	pigsty	35.5 KiB	postgresql-13-count-distinct_3.0.2-1PIGSTY~noble_amd64.deb
`postgresql-13-count-distinct`	3.0.2	`u24.aarch64`	pigsty	35.1 KiB	postgresql-13-count-distinct_3.0.2-1PIGSTY~noble_arm64.deb

Source

Repository

github.com/tvondra/count_distinct

Source Tarball

count_distinct-3.0.2.tar.gz

pig build get count_distinct; # get count_distinct source code
pig build dep count_distinct; # install build dependencies
pig build pkg count_distinct; # build extension rpm or deb
pig build ext count_distinct; # build extension rpms

Install

To add the required PGDG / PIGSTY upstream repository, use:

pig repo add pgsql -u   # add PGDG + Pigsty repo and update cache (leave existing repos)

Install this extension with:

pig ext install count_distinct; # install by extension name, for the current active PG version
pig ext install count_distinct; # install via package alias, for the active PG version
pig ext install count_distinct -v 18;   # install for PG 18
pig ext install count_distinct -v 17;   # install for PG 17
pig ext install count_distinct -v 16;   # install for PG 16
pig ext install count_distinct -v 15;   # install for PG 15
pig ext install count_distinct -v 14;   # install for PG 14
pig ext install count_distinct -v 13;   # install for PG 13

Create this extension with:

CREATE EXTENSION count_distinct;

Last updated on 2025-11-02

lower_quantile omnisketch