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https://issues.apache.org/jira/browse/ARROW-7045?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17008948#comment-17008948
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Neal Richardson commented on ARROW-7045:
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Nice work. A PR would be great, thanks!
> [R] Factor type not preserved in Parquet roundtrip
> --------------------------------------------------
>
> Key: ARROW-7045
> URL: https://issues.apache.org/jira/browse/ARROW-7045
> Project: Apache Arrow
> Issue Type: Bug
> Components: R
> Reporter: Neal Richardson
> Priority: Major
>
> {code:r}
> test_that("Factors are preserved when writing/reading from Parquet", {
> tf <- tempfile()
> on.exit(unlink(tf))
> df <- data.frame(a = factor(c("a", "b")))
> write_parquet(df, tf)
> expect_equivalent(read_parquet(tf), df)
> })
> {code}
> Fails:
> {code}
> `object` not equivalent to `expected`.
> Component “a”: target is character, current is factor
> {code}
> This has to do with the translation with Parquet and not the R <--> Arrow
> type mapping (unlike ARROW-7028). If you write_feather and read_feather, the
> test passes.
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