Last updated: 2024-07-17
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| File | Version | Author | Date | Message |
|---|---|---|---|---|
| Rmd | 1b02e91 | Dave Tang | 2024-07-17 | Getting started with the R arrow package |
The {arrow} package provides an interface to the Arrow C++ library.
Apache Arrow is a cross-language development platform for in-memory data. It specifies a standardized language-independent columnar memory format for flat and hierarchical data, organized for efficient analytic operations on modern hardware.
An example file was downloaded using curl.
outdir <- 'data'
library_file <- "seattle-library-checkouts.csv"
outfile <- paste0(outdir, '/', library_file)
stopifnot(file.exists(outfile))File size.
file.size(outfile) |> utils:::format.object_size(units = 'Gb')[1] "8.6 Gb"arrow::open_dataset() will scan a the input file and
figure out the structure of the dataset; it will only read further rows
if specified.
seattle_csv <- arrow::open_dataset(sources = outfile, format = 'csv')
seattle_csvFileSystemDataset with 1 csv file
12 columns
UsageClass: string
CheckoutType: string
MaterialType: string
CheckoutYear: int64
CheckoutMonth: int64
Checkouts: int64
Title: string
ISBN: null
Creator: string
Subjects: string
Publisher: string
PublicationYear: stringGet a glimpse of the data.
seattle_csv |> dplyr::glimpse()FileSystemDataset with 1 csv file
41,389,465 rows x 12 columns
$ UsageClass <string> "Physical", "Physical", "Digital", "Physical", "Physi…
$ CheckoutType <string> "Horizon", "Horizon", "OverDrive", "Horizon", "Horizo…
$ MaterialType <string> "BOOK", "BOOK", "EBOOK", "BOOK", "SOUNDDISC", "BOOK",…
$ CheckoutYear <int64> 2016, 2016, 2016, 2016, 2016, 2016, 2016, 2016, 2016,…
$ CheckoutMonth <int64> 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,…
$ Checkouts <int64> 1, 1, 1, 1, 1, 1, 1, 1, 4, 1, 1, 2, 3, 2, 1, 3, 2, 3,…
$ Title <string> "Super rich : a guide to having it all / Russell Simm…
$ ISBN <null> NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, N…
$ Creator <string> "Simmons, Russell", "Barclay, James, 1965-", "Tim Par…
$ Subjects <string> "Self realization, Conduct of life, Attitude Psycholo…
$ Publisher <string> "Gotham Books,", "Pyr,", "Random House, Inc.", "Dial …
$ PublicationYear <string> "c2011.", "2010.", "2015", "2005.", "c2004.", "c2005.…Use collect() to force arrow to perform a computation to
return some data.
seattle_csv |>
dplyr::count(CheckoutYear, wt = Checkouts) |>
dplyr::arrange(CheckoutYear) |>
dplyr::collect()# A tibble: 18 × 2
CheckoutYear n
<int> <int>
1 2005 3798685
2 2006 6599318
3 2007 7126627
4 2008 8438486
5 2009 9135167
6 2010 8608966
7 2011 8321732
8 2012 8163046
9 2013 9057096
10 2014 9136081
11 2015 9084179
12 2016 9021051
13 2017 9231648
14 2018 9149176
15 2019 9199083
16 2020 6053717
17 2021 7361031
18 2022 7001989
sessionInfo()R version 4.4.0 (2024-04-24)
Platform: x86_64-pc-linux-gnu
Running under: Ubuntu 22.04.4 LTS
Matrix products: default
BLAS: /usr/lib/x86_64-linux-gnu/openblas-pthread/libblas.so.3
LAPACK: /usr/lib/x86_64-linux-gnu/openblas-pthread/libopenblasp-r0.3.20.so; LAPACK version 3.10.0
locale:
[1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C
[3] LC_TIME=en_US.UTF-8 LC_COLLATE=en_US.UTF-8
[5] LC_MONETARY=en_US.UTF-8 LC_MESSAGES=en_US.UTF-8
[7] LC_PAPER=en_US.UTF-8 LC_NAME=C
[9] LC_ADDRESS=C LC_TELEPHONE=C
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C
time zone: Etc/UTC
tzcode source: system (glibc)
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] arrow_16.1.0 workflowr_1.7.1
loaded via a namespace (and not attached):
[1] bit_4.0.5 jsonlite_1.8.8 dplyr_1.1.4 compiler_4.4.0
[5] promises_1.3.0 tidyselect_1.2.1 Rcpp_1.0.12 stringr_1.5.1
[9] git2r_0.33.0 assertthat_0.2.1 callr_3.7.6 later_1.3.2
[13] jquerylib_0.1.4 yaml_2.3.8 fastmap_1.2.0 R6_2.5.1
[17] generics_0.1.3 knitr_1.46 tibble_3.2.1 rprojroot_2.0.4
[21] bslib_0.7.0 pillar_1.9.0 rlang_1.1.3 utf8_1.2.4
[25] cachem_1.1.0 stringi_1.8.4 httpuv_1.6.15 xfun_0.44
[29] getPass_0.2-4 fs_1.6.4 sass_0.4.9 bit64_4.0.5
[33] cli_3.6.2 withr_3.0.0 magrittr_2.0.3 ps_1.7.6
[37] digest_0.6.35 processx_3.8.4 rstudioapi_0.16.0 lifecycle_1.0.4
[41] vctrs_0.6.5 evaluate_0.23 glue_1.7.0 whisker_0.4.1
[45] fansi_1.0.6 purrr_1.0.2 rmarkdown_2.27 httr_1.4.7
[49] tools_4.4.0 pkgconfig_2.0.3 htmltools_0.5.8.1