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https://issues.apache.org/jira/browse/ARROW-16768?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17557563#comment-17557563
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Neal Richardson commented on ARROW-16768:
-----------------------------------------
Agree that we should handle this more gracefully one way or another.
[~jorisvandenbossche] is this something that is dealt with in pyarrow/pandas
too?
> [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
> Fix For: 9.0.0
>
>
> 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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