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From "Hossein Falaki (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-17902) collect() ignores stringsAsFactors
Date Wed, 18 Oct 2017 20:24:00 GMT

    [ https://issues.apache.org/jira/browse/SPARK-17902?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16209958#comment-16209958
] 

Hossein Falaki commented on SPARK-17902:
----------------------------------------

A simple unit test we could add would be:

{code}
> df <- createDataFrame(iris)
> sapply(iris, typeof) == sapply(collect(df, stringsAsFactors = T), typeof)
Sepal.Length  Sepal.Width Petal.Length  Petal.Width      Species
        TRUE         TRUE         TRUE         TRUE        FALSE
{code}

As for the solution, I suggest performing the conversion inside [this loop|https://github.com/apache/spark/blob/master/R/pkg/R/DataFrame.R#L1168].

> collect() ignores stringsAsFactors
> ----------------------------------
>
>                 Key: SPARK-17902
>                 URL: https://issues.apache.org/jira/browse/SPARK-17902
>             Project: Spark
>          Issue Type: Bug
>          Components: SparkR
>    Affects Versions: 2.0.1
>            Reporter: Hossein Falaki
>
> `collect()` function signature includes an optional flag named `stringsAsFactors`. It
seems it is completely ignored.
> {code}
> str(collect(createDataFrame(iris), stringsAsFactors = TRUE)))
> {code}



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