R Observatory: Metrics for nanoparquet version 0.5.2

Balamuta, James Joseph

doi:10.5281/zenodo.21843040

nanoparquet

0.5.2Package record

Read and Write 'Parquet' Files

13packages dependsuggested by 22

273.1Kdownloads / year

92.9%test coverage

13/13flavors OK

Overview

About

Maintained by Gábor CsárdiCRAN page ↗GitHub ↗Website ↗Issues ↗

Self-sufficient reader and writer for flat 'Parquet' files. Can read most 'Parquet' data types. Can write many 'R' data types, including factors and temporal types. See docs for limitations.

Changes in 0.5.2

The default row group size (num_rows_per_row_group option) is now 122,880 rows, the same as DuckDB's default (#168).
nanoparquet now compiles with clang 23.
read_parquet() now reads missing values correctly when col_select selects a subset of the columns, or reorders them (#170).
read_parquet() now works correctly when selecting list columns in col_select, by name or position.
write_parquet() now writes correct min/max statistics for dictionary encoded POSIXct and difftime columns (#169).
write_parquet() no longer crashes when writing optional columns whose data size causes more Parquet pages to be allocated than there are rows (#147).

Show all changes in 0.5.2Hide the rest of the changes in 0.5.2

write_parquet(file = ":stdout:") now produces correct output on Windows. Previously the standard output stream was in text mode, so newline bytes were translated to CRLF, corrupting the binary Parquet output.

From NEWS.md in the release

Install

R (CRAN)pak (dev)Ubuntu (r2u)Fedora (COPR)openSUSE (OBS)

install.packages("nanoparquet", repos = "https://cloud.r-project.org/")

Installs the current CRAN release. Prebuilt binaries on Windows and macOS.

if (!requireNamespace("pak", quietly = TRUE))
  install.packages("pak", repos = "https://cloud.r-project.org/")
pak::pak("r-lib/nanoparquet")

Development version from r-lib/nanoparquet. Installs pak first if it is not already available.

Release

# enable cranapt (r2u) if it is not already set up, then install
grep -rqs r2u.stat.illinois.edu /etc/apt/sources.list /etc/apt/sources.list.d/ \
  || curl -fsSL https://raw.githubusercontent.com/eddelbuettel/r2u/master/inst/scripts/add_cranapt_noble.sh | sudo bash
sudo apt install -y r-cran-nanoparquet

Fast Ubuntu binaries via r2u (no compilation). The cranapt setup runs once and is skipped when it is already enabled. We list this channel from recorded r2u download activity rather than from a live index of the repository, so treat it as last known rather than guaranteed.

bspm (used by r2u) also needs make: sudo apt install make

# enable the iucar/cran COPR if it is not already present, then install
ls /etc/yum.repos.d/*iucar*cran*.repo >/dev/null 2>&1 \
  || sudo dnf copr enable -y iucar/cran
sudo dnf install -y R-CRAN-nanoparquet

RPMs from the iucar/cran COPR, rebuilt from CRAN.

For install.packages() integration in R, also: sudo dnf install R-CoprManager

# add the autoCRAN OBS repo (Tumbleweed) if it is missing, then install
zypper -q lr | grep -qi autoCRAN \
  || sudo zypper addrepo https://download.opensuse.org/repositories/devel:/languages:/R:/autoCRAN/openSUSE_Tumbleweed/devel:languages:R:autoCRAN.repo
sudo zypper install -y R-nanoparquet

RPMs auto-built from CRAN on openSUSE OBS (Tumbleweed). We list this channel from recorded autoCRAN download activity rather than from a live index of the repository, so treat it as last known rather than guaranteed.

Health

CRAN checks

13OK

CRAN check page ↗

Slowest check: 4.9 min · r-release-linux-x86_64

Status changes

OK13 OK2026-08-05
NOTE12 OK, 1 NOTE2026-08-01
OK12 OK, 1 FAILURE2026-06-08
ERROR12 OK, 1 ERROR2026-06-07
OK14 OK2026-04-21

Show 3 earlier changesHide 3 earlier changes

ERROR13 OK, 1 ERROR2026-04-15
OK14 OK2026-04-14
ERROR12 OK, 1 NOTE, 1 ERROR2026-03-10

Advisories

none known

How this is measured·How advisories are found

Documentation

In release 0.5.2

READMEYes · 561 wordsVignettes· In the repository, left out of the releaseNEWSYes · 100% structured · mentions 0.5.2Citation fileNoWebsiteYes · pkgdown

The repository also keeps web-only articles.

Help pages: 18 (4 internal)includes a package overview page
Examples that run: 100%8 run in a plain check (3 of them under a condition)
Exported functions with examples: 55%
Documented parameters: 98%
Return-value docs: 91%
Help pages citing references: 0%

How these are measured

Downloads

273.1K

CRAN downloads in the past year

Rank #768 · ~748/day · ~22.8K/mo

Releases R versions

Daily download trend is not available in this view yet.

22.2K30 days

63.5K90 days

273.1K1 year

Compare downloads with other packages →

Also on6.6K r2u9 autocran12.5K conda_forge

How downloads are counted

Repository

r-lib/nanoparquet ↗Organization: r-lib

86Stars

9Forks

31Open issues

0Open PRs

10Releases

862Commits

9Commit identities

parquetr

862 commits · Last activity 2026-10-15 · +1.2% stars, 30d · Default branch at 0.5.2.9000, ahead of CRAN 0.5.2 (checked 2026-10-11)

Responsiveness

How these are sampled

PRs merged (all time): 97%
Median days to close, 50 most recently updated closed issues: 20
Median days to close, 50 most recently updated closed PRs: 0

Stars over time

2025-10-09 · 752026-09-20 · 86

How these are measured

PracticesBeta

10 development-tooling and community-health practices detected across 4 families in the upstream repository

Checks run against github.com/r-lib/nanoparquet on 2026-10-11.

Continuous integration (2)

GitHub ActionsR CMD check workflow

The R CMD check workflow runs on Linux, macOS and Windows, and on R-devel

Docs source (3)

pkgdown

GitHub Pages site last deployed 2026-10-09 · The repository has a site deploy workflow

pkgdown site last built 2026-09-16

Coverage (2)

Coverage reporting (Codecov).covrignore

Lint, format, editor (3)

Lint workflowAirVS Code

How this is detected·Detection ruleset v3 (2026-09-26)

AI coding toolsBeta

This repository shows signs of AI coding tools.

Claude Codefirst seen 2026-04-06
Seen in the repository: CLAUDE.md
Named in .Rbuildignore: CLAUDE.md
GitHub Copilotfirst seen 2026-06-19
Commits: 2 by its own account

Counts are commits, not lines of code. Commits by a tool's accounts count once across all of its accounts. Commits crediting it are the largest count among its credit lines, a minimum.How this is detected·Detection ruleset v4 (updated 2026-09-27)

Dependencies

Declared dependencies

14 external dependencies (excludes base and recommended)

Installing nanoparquet adds no packages beyond those that come with R.

Depends (1)

R >= 4.0.0

Imports (0)

none

LinkingTo (0)

none

Suggests (14)

arrow bit64 blob DBI duckdb hms mockery pillar processx rprojroot spelling testthat tzdb withr

Enhances (0)

none

Dependency license breakdown →

Reverse dependencies

13direct

9indirect

Imports 13

Suggested by 22

Show all 35 packagesHide all 35 packages

Depends, Imports or LinkingTo, most downloaded first

bigrquery rerddap fitzRoy tidyfinance rdatagouv tongfen unsum CohortContrast artoo whep datasetviewer edfinr electedBR

Suggests, most downloaded first

datawizard rio marginaleffects modelbased pins tarchetypes Rdatasets libr mark plumber2 ibawds rmoriedata querychat crawlee rtemis carbondata datadict tidylearn corella aurora irelink SynthesizerPlus

How these are counted

Code & Tests

People & History

People (9)

Gábor Csárdi

Author, Maintainer since 0.2.0 (2024)

Hannes Mühleisen

Author, Copyright holder

Apache Software Foundation

Copyright holder

Facebook, Inc.

Copyright holder · added in 0.3.0

Google Inc.

Copyright holder

Posit Software, PBC

Copyright holder

RAD Game Tools

Copyright holder · added in 0.3.0

Tenacious Software LLC

Copyright holder · added in 0.3.0

Valve Software

Copyright holder · added in 0.3.0

Releases (10)

Pick two releases to compare their code metrics.

0.5.2Latest
record
2026-09-16 · current release · diff ↗ ·
added 1 export
edit_parquet_metadata
R
R 4.6.0 released · 2026-04-24
0.5.1
record
2026-04-20 · diff ↗
0.5.0
record
2026-04-11 · diff ↗
0.4.3
record
2025-12-17 · diff ↗
R
R 4.5.0 released · 2025-04-11
0.4.2
record
2025-02-22 · diff ↗
0.4.1
record
2025-02-10 · diff ↗
0.4.0
record
2025-01-29 · diff ↗ ·
added 5 exports
append_parquet, infer_parquet_schema, read_parquet_info, read_parquet_metadata, read_parquet_schema
0.3.1
record
2024-07-01 · diff ↗
0.3.0
record
2024-06-17 · diff ↗ ·
removed 1 export
parquet_columns

added 2 exports
parquet_column_types, parquet_options
0.2.0
record
2024-05-30
R
R 4.4.0 released · 2024-04-24

Package metadata

First published: 2024-05-30
Total releases: 10 / 2 yrs
License: MIT + file LICENSE OSI
Minimum R: ≥ 4.0.0
Download size: 1.1 MB

Cite

Cite this package

Run in R for the authors' preferred citation:

citation("nanoparquet")

Format

Csárdi, G., Apache Software Foundation, Facebook, Inc., Google Inc., Posit Software, PBC, RAD Game Tools, Tenacious Software LLC, Valve Software, & Mühleisen, H. (2026). nanoparquet: Read and Write 'Parquet' Files (Version 0.5.2) [Computer software]. https://doi.org/10.32614/CRAN.package.nanoparquet

This package has no citation file, so citation() returns this entry built from DESCRIPTION.

Cite the R Observatory

For a number measured here: a download total, a coverage figure, an archival date.

Format

APA

Balamuta, J. J. (2026). R Observatory: Metrics for nanoparquet version 0.5.2 [Data set]. HJJB, LLC. Data release v2026-10-18. https://doi.org/10.5281/zenodo.21843040

From data release v2026-10-18, which the citation names so these numbers can be found later. More on citing and the projects behind them.

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