lower_quantile

lower_quantile : Lower quantile aggregate function

Overview

ID	Extension	Package	Version	Category	License	Language
4620	lower_quantile	lower_quantile	`1.0.3`	FUNC	BSD 2-Clause	C

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

Relationships
See Also	quantile topn ddsketch omnisketch count_distinct first_last_agg

Packages

Type	Repo	Version	PG Major Compatibility	Package Pattern	Dependencies
EXT	PIGSTY	`1.0.3`	18 17 16 15 14	`lower_quantile`	-
RPM	PIGSTY	`1.0.3`	18 17 16 15 14	`lower_quantile_$v`	-
DEB	PIGSTY	`1.0.3`	18 17 16 15 14	`postgresql-$v-lower-quantile`	-

Linux / PG	PG18	PG17	PG16	PG15	PG14
el8.x86_64	PIGSTY 1.0.3	PIGSTY 1.0.3	PIGSTY 1.0.3	PIGSTY 1.0.3	PIGSTY 1.0.3
el8.aarch64	PIGSTY 1.0.3	PIGSTY 1.0.3	PIGSTY 1.0.3	PIGSTY 1.0.3	PIGSTY 1.0.3
el9.x86_64	PIGSTY 1.0.3	PIGSTY 1.0.3	PIGSTY 1.0.3	PIGSTY 1.0.3	PIGSTY 1.0.3
el9.aarch64	PIGSTY 1.0.3	PIGSTY 1.0.3	PIGSTY 1.0.3	PIGSTY 1.0.3	PIGSTY 1.0.3
el10.x86_64	PIGSTY 1.0.3	PIGSTY 1.0.3	PIGSTY 1.0.3	PIGSTY 1.0.3	PIGSTY 1.0.3
el10.aarch64	PIGSTY 1.0.3	PIGSTY 1.0.3	PIGSTY 1.0.3	PIGSTY 1.0.3	PIGSTY 1.0.3
d12.x86_64	PIGSTY 1.0.3	PIGSTY 1.0.3	PIGSTY 1.0.3	PIGSTY 1.0.3	PIGSTY 1.0.3
d12.aarch64	PIGSTY 1.0.3	PIGSTY 1.0.3	PIGSTY 1.0.3	PIGSTY 1.0.3	PIGSTY 1.0.3
d13.x86_64	PIGSTY 1.0.3	PIGSTY 1.0.3	PIGSTY 1.0.3	PIGSTY 1.0.3	PIGSTY 1.0.3
d13.aarch64	PIGSTY 1.0.3	PIGSTY 1.0.3	PIGSTY 1.0.3	PIGSTY 1.0.3	PIGSTY 1.0.3
u22.x86_64	PIGSTY 1.0.3	PIGSTY 1.0.3	PIGSTY 1.0.3	PIGSTY 1.0.3	PIGSTY 1.0.3
u22.aarch64	PIGSTY 1.0.3	PIGSTY 1.0.3	PIGSTY 1.0.3	PIGSTY 1.0.3	PIGSTY 1.0.3
u24.x86_64	PIGSTY 1.0.3	PIGSTY 1.0.3	PIGSTY 1.0.3	PIGSTY 1.0.3	PIGSTY 1.0.3
u24.aarch64	PIGSTY 1.0.3	PIGSTY 1.0.3	PIGSTY 1.0.3	PIGSTY 1.0.3	PIGSTY 1.0.3

Package	Version	OS	ORG	SIZE	File URL
`lower_quantile_18`	`1.0.3`	el8.x86_64	pigsty	15.5 KiB	lower_quantile_18-1.0.3-1PIGSTY.el8.x86_64.rpm
`lower_quantile_18`	`1.0.3`	el8.aarch64	pigsty	15.4 KiB	lower_quantile_18-1.0.3-1PIGSTY.el8.aarch64.rpm
`lower_quantile_18`	`1.0.3`	el9.x86_64	pigsty	15.4 KiB	lower_quantile_18-1.0.3-1PIGSTY.el9.x86_64.rpm
`lower_quantile_18`	`1.0.3`	el9.aarch64	pigsty	15.3 KiB	lower_quantile_18-1.0.3-1PIGSTY.el9.aarch64.rpm
`lower_quantile_18`	`1.0.3`	el10.x86_64	pigsty	15.3 KiB	lower_quantile_18-1.0.3-1PIGSTY.el10.x86_64.rpm
`lower_quantile_18`	`1.0.3`	el10.aarch64	pigsty	15.4 KiB	lower_quantile_18-1.0.3-1PIGSTY.el10.aarch64.rpm
`postgresql-18-lower-quantile`	`1.0.3`	d12.x86_64	pigsty	16.4 KiB	postgresql-18-lower-quantile_1.0.3-1PIGSTY~bookworm_amd64.deb
`postgresql-18-lower-quantile`	`1.0.3`	d12.aarch64	pigsty	16.2 KiB	postgresql-18-lower-quantile_1.0.3-1PIGSTY~bookworm_arm64.deb
`postgresql-18-lower-quantile`	`1.0.3`	d13.x86_64	pigsty	16.4 KiB	postgresql-18-lower-quantile_1.0.3-1PIGSTY~trixie_amd64.deb
`postgresql-18-lower-quantile`	`1.0.3`	d13.aarch64	pigsty	16.2 KiB	postgresql-18-lower-quantile_1.0.3-1PIGSTY~trixie_arm64.deb
`postgresql-18-lower-quantile`	`1.0.3`	u22.x86_64	pigsty	16.7 KiB	postgresql-18-lower-quantile_1.0.3-1PIGSTY~jammy_amd64.deb
`postgresql-18-lower-quantile`	`1.0.3`	u22.aarch64	pigsty	16.3 KiB	postgresql-18-lower-quantile_1.0.3-1PIGSTY~jammy_arm64.deb
`postgresql-18-lower-quantile`	`1.0.3`	u24.x86_64	pigsty	16.9 KiB	postgresql-18-lower-quantile_1.0.3-1PIGSTY~noble_amd64.deb
`postgresql-18-lower-quantile`	`1.0.3`	u24.aarch64	pigsty	16.5 KiB	postgresql-18-lower-quantile_1.0.3-1PIGSTY~noble_arm64.deb

Package	Version	OS	ORG	SIZE	File URL
`lower_quantile_17`	`1.0.3`	el8.x86_64	pigsty	15.6 KiB	lower_quantile_17-1.0.3-1PIGSTY.el8.x86_64.rpm
`lower_quantile_17`	`1.0.3`	el8.aarch64	pigsty	15.4 KiB	lower_quantile_17-1.0.3-1PIGSTY.el8.aarch64.rpm
`lower_quantile_17`	`1.0.3`	el9.x86_64	pigsty	15.4 KiB	lower_quantile_17-1.0.3-1PIGSTY.el9.x86_64.rpm
`lower_quantile_17`	`1.0.3`	el9.aarch64	pigsty	15.3 KiB	lower_quantile_17-1.0.3-1PIGSTY.el9.aarch64.rpm
`lower_quantile_17`	`1.0.3`	el10.x86_64	pigsty	15.3 KiB	lower_quantile_17-1.0.3-1PIGSTY.el10.x86_64.rpm
`lower_quantile_17`	`1.0.3`	el10.aarch64	pigsty	15.3 KiB	lower_quantile_17-1.0.3-1PIGSTY.el10.aarch64.rpm
`postgresql-17-lower-quantile`	`1.0.3`	d12.x86_64	pigsty	16.8 KiB	postgresql-17-lower-quantile_1.0.3-1PIGSTY~bookworm_amd64.deb
`postgresql-17-lower-quantile`	`1.0.3`	d12.aarch64	pigsty	16.6 KiB	postgresql-17-lower-quantile_1.0.3-1PIGSTY~bookworm_arm64.deb
`postgresql-17-lower-quantile`	`1.0.3`	d13.x86_64	pigsty	16.8 KiB	postgresql-17-lower-quantile_1.0.3-1PIGSTY~trixie_amd64.deb
`postgresql-17-lower-quantile`	`1.0.3`	d13.aarch64	pigsty	16.6 KiB	postgresql-17-lower-quantile_1.0.3-1PIGSTY~trixie_arm64.deb
`postgresql-17-lower-quantile`	`1.0.3`	u22.x86_64	pigsty	17.7 KiB	postgresql-17-lower-quantile_1.0.3-1PIGSTY~jammy_amd64.deb
`postgresql-17-lower-quantile`	`1.0.3`	u22.aarch64	pigsty	17.3 KiB	postgresql-17-lower-quantile_1.0.3-1PIGSTY~jammy_arm64.deb
`postgresql-17-lower-quantile`	`1.0.3`	u24.x86_64	pigsty	17.2 KiB	postgresql-17-lower-quantile_1.0.3-1PIGSTY~noble_amd64.deb
`postgresql-17-lower-quantile`	`1.0.3`	u24.aarch64	pigsty	16.9 KiB	postgresql-17-lower-quantile_1.0.3-1PIGSTY~noble_arm64.deb

Package	Version	OS	ORG	SIZE	File URL
`lower_quantile_16`	`1.0.3`	el8.x86_64	pigsty	15.6 KiB	lower_quantile_16-1.0.3-1PIGSTY.el8.x86_64.rpm
`lower_quantile_16`	`1.0.3`	el8.aarch64	pigsty	15.4 KiB	lower_quantile_16-1.0.3-1PIGSTY.el8.aarch64.rpm
`lower_quantile_16`	`1.0.3`	el9.x86_64	pigsty	15.4 KiB	lower_quantile_16-1.0.3-1PIGSTY.el9.x86_64.rpm
`lower_quantile_16`	`1.0.3`	el9.aarch64	pigsty	15.3 KiB	lower_quantile_16-1.0.3-1PIGSTY.el9.aarch64.rpm
`lower_quantile_16`	`1.0.3`	el10.x86_64	pigsty	15.3 KiB	lower_quantile_16-1.0.3-1PIGSTY.el10.x86_64.rpm
`lower_quantile_16`	`1.0.3`	el10.aarch64	pigsty	15.3 KiB	lower_quantile_16-1.0.3-1PIGSTY.el10.aarch64.rpm
`postgresql-16-lower-quantile`	`1.0.3`	d12.x86_64	pigsty	16.4 KiB	postgresql-16-lower-quantile_1.0.3-1PIGSTY~bookworm_amd64.deb
`postgresql-16-lower-quantile`	`1.0.3`	d12.aarch64	pigsty	16.2 KiB	postgresql-16-lower-quantile_1.0.3-1PIGSTY~bookworm_arm64.deb
`postgresql-16-lower-quantile`	`1.0.3`	d13.x86_64	pigsty	16.4 KiB	postgresql-16-lower-quantile_1.0.3-1PIGSTY~trixie_amd64.deb
`postgresql-16-lower-quantile`	`1.0.3`	d13.aarch64	pigsty	16.2 KiB	postgresql-16-lower-quantile_1.0.3-1PIGSTY~trixie_arm64.deb
`postgresql-16-lower-quantile`	`1.0.3`	u22.x86_64	pigsty	17.5 KiB	postgresql-16-lower-quantile_1.0.3-1PIGSTY~jammy_amd64.deb
`postgresql-16-lower-quantile`	`1.0.3`	u22.aarch64	pigsty	17.1 KiB	postgresql-16-lower-quantile_1.0.3-1PIGSTY~jammy_arm64.deb
`postgresql-16-lower-quantile`	`1.0.3`	u24.x86_64	pigsty	16.9 KiB	postgresql-16-lower-quantile_1.0.3-1PIGSTY~noble_amd64.deb
`postgresql-16-lower-quantile`	`1.0.3`	u24.aarch64	pigsty	16.5 KiB	postgresql-16-lower-quantile_1.0.3-1PIGSTY~noble_arm64.deb

Package	Version	OS	ORG	SIZE	File URL
`lower_quantile_15`	`1.0.3`	el8.x86_64	pigsty	15.6 KiB	lower_quantile_15-1.0.3-1PIGSTY.el8.x86_64.rpm
`lower_quantile_15`	`1.0.3`	el8.aarch64	pigsty	15.4 KiB	lower_quantile_15-1.0.3-1PIGSTY.el8.aarch64.rpm
`lower_quantile_15`	`1.0.3`	el9.x86_64	pigsty	15.4 KiB	lower_quantile_15-1.0.3-1PIGSTY.el9.x86_64.rpm
`lower_quantile_15`	`1.0.3`	el9.aarch64	pigsty	15.3 KiB	lower_quantile_15-1.0.3-1PIGSTY.el9.aarch64.rpm
`lower_quantile_15`	`1.0.3`	el10.x86_64	pigsty	15.3 KiB	lower_quantile_15-1.0.3-1PIGSTY.el10.x86_64.rpm
`lower_quantile_15`	`1.0.3`	el10.aarch64	pigsty	15.3 KiB	lower_quantile_15-1.0.3-1PIGSTY.el10.aarch64.rpm
`postgresql-15-lower-quantile`	`1.0.3`	d12.x86_64	pigsty	16.4 KiB	postgresql-15-lower-quantile_1.0.3-1PIGSTY~bookworm_amd64.deb
`postgresql-15-lower-quantile`	`1.0.3`	d12.aarch64	pigsty	16.2 KiB	postgresql-15-lower-quantile_1.0.3-1PIGSTY~bookworm_arm64.deb
`postgresql-15-lower-quantile`	`1.0.3`	d13.x86_64	pigsty	16.4 KiB	postgresql-15-lower-quantile_1.0.3-1PIGSTY~trixie_amd64.deb
`postgresql-15-lower-quantile`	`1.0.3`	d13.aarch64	pigsty	16.2 KiB	postgresql-15-lower-quantile_1.0.3-1PIGSTY~trixie_arm64.deb
`postgresql-15-lower-quantile`	`1.0.3`	u22.x86_64	pigsty	17.4 KiB	postgresql-15-lower-quantile_1.0.3-1PIGSTY~jammy_amd64.deb
`postgresql-15-lower-quantile`	`1.0.3`	u22.aarch64	pigsty	17.0 KiB	postgresql-15-lower-quantile_1.0.3-1PIGSTY~jammy_arm64.deb
`postgresql-15-lower-quantile`	`1.0.3`	u24.x86_64	pigsty	16.9 KiB	postgresql-15-lower-quantile_1.0.3-1PIGSTY~noble_amd64.deb
`postgresql-15-lower-quantile`	`1.0.3`	u24.aarch64	pigsty	16.5 KiB	postgresql-15-lower-quantile_1.0.3-1PIGSTY~noble_arm64.deb

Package	Version	OS	ORG	SIZE	File URL
`lower_quantile_14`	`1.0.3`	el8.x86_64	pigsty	15.5 KiB	lower_quantile_14-1.0.3-1PIGSTY.el8.x86_64.rpm
`lower_quantile_14`	`1.0.3`	el8.aarch64	pigsty	15.4 KiB	lower_quantile_14-1.0.3-1PIGSTY.el8.aarch64.rpm
`lower_quantile_14`	`1.0.3`	el9.x86_64	pigsty	15.4 KiB	lower_quantile_14-1.0.3-1PIGSTY.el9.x86_64.rpm
`lower_quantile_14`	`1.0.3`	el9.aarch64	pigsty	15.2 KiB	lower_quantile_14-1.0.3-1PIGSTY.el9.aarch64.rpm
`lower_quantile_14`	`1.0.3`	el10.x86_64	pigsty	15.3 KiB	lower_quantile_14-1.0.3-1PIGSTY.el10.x86_64.rpm
`lower_quantile_14`	`1.0.3`	el10.aarch64	pigsty	15.3 KiB	lower_quantile_14-1.0.3-1PIGSTY.el10.aarch64.rpm
`postgresql-14-lower-quantile`	`1.0.3`	d12.x86_64	pigsty	16.4 KiB	postgresql-14-lower-quantile_1.0.3-1PIGSTY~bookworm_amd64.deb
`postgresql-14-lower-quantile`	`1.0.3`	d12.aarch64	pigsty	16.2 KiB	postgresql-14-lower-quantile_1.0.3-1PIGSTY~bookworm_arm64.deb
`postgresql-14-lower-quantile`	`1.0.3`	d13.x86_64	pigsty	16.4 KiB	postgresql-14-lower-quantile_1.0.3-1PIGSTY~trixie_amd64.deb
`postgresql-14-lower-quantile`	`1.0.3`	d13.aarch64	pigsty	16.2 KiB	postgresql-14-lower-quantile_1.0.3-1PIGSTY~trixie_arm64.deb
`postgresql-14-lower-quantile`	`1.0.3`	u22.x86_64	pigsty	17.4 KiB	postgresql-14-lower-quantile_1.0.3-1PIGSTY~jammy_amd64.deb
`postgresql-14-lower-quantile`	`1.0.3`	u22.aarch64	pigsty	17.0 KiB	postgresql-14-lower-quantile_1.0.3-1PIGSTY~jammy_arm64.deb
`postgresql-14-lower-quantile`	`1.0.3`	u24.x86_64	pigsty	16.8 KiB	postgresql-14-lower-quantile_1.0.3-1PIGSTY~noble_amd64.deb
`postgresql-14-lower-quantile`	`1.0.3`	u24.aarch64	pigsty	16.5 KiB	postgresql-14-lower-quantile_1.0.3-1PIGSTY~noble_arm64.deb

Source

Repository

github.com/tvondra/lower_quantile

Source Tarball

lower_quantile-1.0.3.tar.gz

pig build pkg lower_quantile;		# build rpm/deb

Install

Make sure PGDG and PIGSTY repo available:

pig repo add pgsql -u   # add both repo and update cache

Install this extension with pig:

pig install lower_quantile;		# install via package name, for the active PG version

pig install lower_quantile -v 18;   # install for PG 18
pig install lower_quantile -v 17;   # install for PG 17
pig install lower_quantile -v 16;   # install for PG 16
pig install lower_quantile -v 15;   # install for PG 15
pig install lower_quantile -v 14;   # install for PG 14

Create this extension with:

CREATE EXTENSION lower_quantile;

Usage

lower_quantile: lower quantile aggregate for PostgreSQL

Implements the “lower quantile” aggregate, which differs slightly from percentile_disc by returning the value whose rank in the sorted multiset is floor(1 + q*(n-1)).

CREATE EXTENSION lower_quantile;

Functions

Function	Description
`lower_quantile(value, quantile float)`	Compute the lower quantile for the given quantile value (0 to 1)

Examples

-- Compute the lower-quantile median
SELECT lower_quantile(i, 0.5)
FROM generate_series(1, 1000) s(i);

-- Compute the 95th lower quantile
SELECT lower_quantile(i, 0.95)
FROM generate_series(1, 1000) s(i);

This definition is used by some papers (e.g., the DDSketch paper) to formulate accuracy guarantees.

Last updated on 2026-03-12

quantile count_distinct