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https://issues.apache.org/jira/browse/SPARK-17781?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15563944#comment-15563944
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Hossein Falaki commented on SPARK-17781:
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Yes, but somehow inside {{worker.R}} Date fields in the list are treated as
Double. Case in point is the reproducing example in the body of the ticket. To
be honest, I am still confused about this too.
> datetime is serialized as double inside dapply()
> ------------------------------------------------
>
> Key: SPARK-17781
> URL: https://issues.apache.org/jira/browse/SPARK-17781
> Project: Spark
> Issue Type: Bug
> Components: SparkR
> Affects Versions: 2.0.0
> Reporter: Hossein Falaki
>
> When we ship a SparkDataFrame to workers for dapply family functions, inside
> the worker DateTime objects are serialized as double.
> To reproduce:
> {code}
> df <- createDataFrame(data.frame(id = 1:10, date = Sys.Date()))
> dapplyCollect(df, function(x) { return(x$date) })
> {code}
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