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https://issues.apache.org/jira/browse/ARROW-16768?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17553546#comment-17553546
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Dewey Dunnington commented on ARROW-16768:
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I don't know how common its usage is, but there's a base R function that will
happily do this for you.
{code:R}
x <- c(1, 1, 2, 2, 3, NA)
addNA(x)
#> [1] 1 1 2 2 3 <NA>
#> Levels: 1 2 3 <NA>
{code}
> [R] Factor levels cannot contain NA
> -----------------------------------
>
> Key: ARROW-16768
> URL: https://issues.apache.org/jira/browse/ARROW-16768
> Project: Apache Arrow
> Issue Type: Bug
> Components: R
> Affects Versions: 7.0.0
> Reporter: Kieran Martin
> Priority: Minor
>
> If you try to write a data frame with a factor with a missing value to
> parquet, you get the error: "Error: Invalid: Cannot insert dictionary values
> containing nulls".
> This seems likely due to how the metadata for factors is currently captured
> in parquet files. Reprex follows:
>
> library(arrow)
> bad_data <- data.frame(A = factor(1, 2, NA))
> write_parquet(bad_data, tempfile())
>
>
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