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https://issues.apache.org/jira/browse/SPARK-11281?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shivaram Venkataraman reopened SPARK-11281:
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Assignee: (was: Maciej Szymkiewicz)
> Issue with creating and collecting DataFrame using environments
> ----------------------------------------------------------------
>
> Key: SPARK-11281
> URL: https://issues.apache.org/jira/browse/SPARK-11281
> Project: Spark
> Issue Type: Bug
> Components: SparkR
> Affects Versions: 1.6.0
> Environment: R 3.2.2, Spark build from master
> 487d409e71767c76399217a07af8de1bb0da7aa8
> Reporter: Maciej Szymkiewicz
> Fix For: 1.6.0
>
>
> It is not possible to to access Map field created from an environment.
> Assuming local data frame is created as follows:
> {code}
> ldf <- data.frame(row.names=1:2)
> ldf$x <- c(as.environment(list(a=1, b=2)), as.environment(list(c=3)))
> str(ldf)
> ## 'data.frame': 2 obs. of 1 variable:
> ## $ x:List of 2
> ## ..$ :<environment: 0x35c94d8>
> ## ..$ :<environment: 0x35c7ac0>
> get("a", ldf$x[[1]])
> ## [1] 1
> get("c", ldf$x[[2]])
> ## [1] 3
> {code}
> It is possible to create a Spark data frame:
> {code}
> sdf <- createDataFrame(sqlContext, ldf)
> printSchema(sdf)
> ## root
> ## |-- x: array (nullable = true)
> ## | |-- element: map (containsNull = true)
> ## | | |-- key: string
> ## | | |-- value: double (valueContainsNull = true)
> {code}
> but it throws:
> {code}
> java.lang.IllegalArgumentException: Invalid array type e
> {code}
> on collect / head.
> Problem seems to be specific to environments and cannot be reproduced when
> Map comes for example from Cassandra table.
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