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lower_quantile

Lower quantile aggregate function

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 ddsketch tdigest weighted_statistics quantile topn count_distinct omnisketch datasketches hll

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
u26.x86_64 PIGSTY 1.0.3 PIGSTY 1.0.3 PIGSTY 1.0.3 PIGSTY 1.0.3 PIGSTY 1.0.3
u26.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
postgresql-18-lower-quantile 1.0.3 u26.x86_64 pigsty 16.8 KiB postgresql-18-lower-quantile_1.0.3-1PIGSTY~resolute_amd64.deb
postgresql-18-lower-quantile 1.0.3 u26.aarch64 pigsty 16.6 KiB postgresql-18-lower-quantile_1.0.3-1PIGSTY~resolute_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
postgresql-17-lower-quantile 1.0.3 u26.x86_64 pigsty 17.3 KiB postgresql-17-lower-quantile_1.0.3-1PIGSTY~resolute_amd64.deb
postgresql-17-lower-quantile 1.0.3 u26.aarch64 pigsty 17.2 KiB postgresql-17-lower-quantile_1.0.3-1PIGSTY~resolute_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
postgresql-16-lower-quantile 1.0.3 u26.x86_64 pigsty 16.9 KiB postgresql-16-lower-quantile_1.0.3-1PIGSTY~resolute_amd64.deb
postgresql-16-lower-quantile 1.0.3 u26.aarch64 pigsty 16.7 KiB postgresql-16-lower-quantile_1.0.3-1PIGSTY~resolute_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
postgresql-15-lower-quantile 1.0.3 u26.x86_64 pigsty 16.9 KiB postgresql-15-lower-quantile_1.0.3-1PIGSTY~resolute_amd64.deb
postgresql-15-lower-quantile 1.0.3 u26.aarch64 pigsty 16.8 KiB postgresql-15-lower-quantile_1.0.3-1PIGSTY~resolute_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
postgresql-14-lower-quantile 1.0.3 u26.x86_64 pigsty 16.9 KiB postgresql-14-lower-quantile_1.0.3-1PIGSTY~resolute_amd64.deb
postgresql-14-lower-quantile 1.0.3 u26.aarch64 pigsty 16.7 KiB postgresql-14-lower-quantile_1.0.3-1PIGSTY~resolute_arm64.deb

Source 

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.