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https://issues.apache.org/jira/browse/ARROW-13169?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17369029#comment-17369029
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Mauricio 'Pachá' Vargas Sepúlveda commented on ARROW-13169:
-----------------------------------------------------------
sorry, I'm using 4.0.1.9000 sync'ed from main repo and re-built last night
> [R] group_by + write_dataset skips some countries with UN COMTRADE / BACI
> datasets
> ----------------------------------------------------------------------------------
>
> Key: ARROW-13169
> URL: https://issues.apache.org/jira/browse/ARROW-13169
> Project: Apache Arrow
> Issue Type: Bug
> Components: R
> Affects Versions: 4.0.1
> Reporter: Mauricio 'Pachá' Vargas Sepúlveda
> Priority: Major
> Fix For: 5.0.0
>
>
> A bit of context: the data for this example contains all the world exports
> in 1995, it contain 212 countries, but when saving it as parquet, only 66
> countries are actually recorded. The verification I included was to check if
> the USA (one of the best in the reporter quality index) was present in the
> data.
> {code:r}
> library(arrow)
> #>
> #> Attaching package: 'arrow'
> #> The following object is masked from 'package:utils':
> #>
> #> timestamp
> library(dplyr)
> #>
> #> Attaching package: 'dplyr'
> #> The following objects are masked from 'package:stats':
> #>
> #> filter, lag
> #> The following objects are masked from 'package:base':
> #>
> #> intersect, setdiff, setequal, union
> url <- "https://ams3.digitaloceanspaces.com/uncomtrade/baci_hs92_1995.rds";
> rds <- "baci_hs92_1995.rds"
> if (!file.exists(rds)) try(download.file(url, rds))
> d <- readRDS("baci_hs92_1995.rds")
> rds_has_usa <- any(grepl("usa", unique(d$reporter_iso)))
> rds_has_usa
> #> [1] TRUE
> dir <- "parquet/baci_hs92"
> d %>%
> group_by(year, reporter_iso) %>%
> write_dataset(dir, hive_style = F)
> parquet_has_usa <- any(grepl("usa", list.files(paste0(dir, "/1995"))))
> parquet_has_usa
> #> [1] FALSE
> {code}
> _Created on 2021-06-24 by the [reprex package](https://reprex.tidyverse.org)
> (v2.0.0)_
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