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https://issues.apache.org/jira/browse/ARROW-8216?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17067961#comment-17067961
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Ben Kietzman commented on ARROW-8216:
-------------------------------------
https://issues.apache.org/jira/browse/ARROW-8235
> [R][C++][Dataset] Filtering returns all-missing rows where the filtering
> column is missing
> ------------------------------------------------------------------------------------------
>
> Key: ARROW-8216
> URL: https://issues.apache.org/jira/browse/ARROW-8216
> Project: Apache Arrow
> Issue Type: Bug
> Components: R
> Affects Versions: 0.16.0
> Environment: R 3.6.3, Windows 10
> Reporter: Sam Albers
> Priority: Minor
> Fix For: 0.17.0
>
>
>
> I have just noticed some slightly odd behaviour with the filter method for
> Dataset.
>
> {code:java}
> library(arrow)
> library(dplyr)
> packageVersion("arrow")
> #> [1] '0.16.0.20200323'
> ## Make sample parquet
> starwars$hair_color[starwars$hair_color == "brown"] <- ""
> dir <- tempdir()
> fpath <- file.path(dir, "data.parquet")
> write_parquet(starwars, fpath)
> ## df in memory
> df_mem <- starwars %>%
> filter(hair_color == "")
> ## reading from the parquet
> df_parquet <- read_parquet(fpath) %>%
> filter(hair_color == "")
> ## using open_dataset
> df_dataset <- open_dataset(dir) %>%
> filter(hair_color == "") %>%
> collect()
> identical(df_mem, df_parquet)
> #> [1] TRUE
> identical(df_mem, df_dataset)
> #> [1] FALSE
> {code}
>
>
> I'm pretty sure all these should return the same data.frame. Am I missing
> something?
>
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