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Posted to jira@arrow.apache.org by "Jonathan Keane (Jira)" <ji...@apache.org> on 2021/02/25 13:47:00 UTC
[jira] [Assigned] (ARROW-11582) [R] write_dataset "format" argument
default and validation could be better
[ https://issues.apache.org/jira/browse/ARROW-11582?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jonathan Keane reassigned ARROW-11582:
--------------------------------------
Assignee: Mauricio 'Pachá' Vargas Sepúlveda
> [R] write_dataset "format" argument default and validation could be better
> --------------------------------------------------------------------------
>
> Key: ARROW-11582
> URL: https://issues.apache.org/jira/browse/ARROW-11582
> Project: Apache Arrow
> Issue Type: Bug
> Components: R
> Affects Versions: 2.0.0
> Environment: R 4.0.3, Ubuntu 20.04.
> sessionInfo():
> > sessionInfo()
> R version 4.0.3 (2020-10-10)
> Platform: x86_64-pc-linux-gnu (64-bit)
> Running under: Ubuntu 20.04 LTS
> Matrix products: default
> BLAS/LAPACK: /usr/lib/x86_64-linux-gnu/openblas-pthread/libopenblasp-r0.3.8.so
> locale:
> [1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C LC_TIME=en_US.UTF-8 LC_COLLATE=en_US.UTF-8
> [5] LC_MONETARY=en_US.UTF-8 LC_MESSAGES=C LC_PAPER=en_US.UTF-8 LC_NAME=C
> [9] LC_ADDRESS=C LC_TELEPHONE=C LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C
> attached base packages:
> [1] stats graphics grDevices utils datasets methods base
> loaded via a namespace (and not attached):
> [1] rstudioapi_0.13 magrittr_2.0.1 hms_0.5.3 tidyselect_1.1.0 bit_4.0.4 R6_2.5.0 rlang_0.4.9
> [8] dplyr_1.0.2 tools_4.0.3 R.oo_1.24.0 arrow_2.0.0 DBI_1.1.0 ellipsis_0.3.1 bit64_4.0.5
> [15] assertthat_0.2.1 tibble_3.0.4 lifecycle_0.2.0 crayon_1.3.4 readr_1.4.0 purrr_0.3.4 arkdb_0.0.8
> [22] duckdb_0.2.4 fs_1.5.0 vctrs_0.3.5 R.utils_2.10.1 curl_4.3 glue_1.4.2 compiler_4.0.3
> [29] pillar_1.4.7 generics_0.1.0 R.methodsS3_1.8.1 pkgconfig_2.0.3
> Reporter: Carl Boettiger
> Assignee: Mauricio 'Pachá' Vargas Sepúlveda
> Priority: Major
> Fix For: 4.0.0
>
>
>
> I'd like to use the R package interface to access data distributed in a tab-separated text file that is much larger than available RAM. I understand that in principle this is possible using `open_datatset()` in text mode and then streaming data out to parquet via `write_dataset()`, but this strategy fails even on small text files with an unexpected error:
> Here's a minimal reproducible example.
>
> fs::dir_create("import_dir")
> readr::write_tsv(mtcars, "import_dir/mtcars.tsv")
> ds <- arrow::open_dataset("import_dir", format="text", delim="\t")
> arrow::write_dataset(ds, "parquet_dir")
> The error I get occurs only on the last line (`write_dataset()`), saying:
> Error in options$update(...) : attempt to apply non-function
>
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