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https://issues.apache.org/jira/browse/SPARK-18226?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15649026#comment-15649026
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Felix Cheung commented on SPARK-18226:
--------------------------------------
We discussed this as a part of the GBT PR, from here
https://github.com/apache/spark/pull/15746#issuecomment-259217671
"
The best sparse vector support in R comes from the Matrix package - But its a
big package and I dont think we should add that as a dependency. We could try
to do a wrapper where if the user already has the package installed we return
it using Matrix ?
"
I think this is a good idea to do in a general sense for any SparseVector in
the SerDe code.
> SparkR displaying vector columns in incorrect way
> -------------------------------------------------
>
> Key: SPARK-18226
> URL: https://issues.apache.org/jira/browse/SPARK-18226
> Project: Spark
> Issue Type: Bug
> Components: SparkR
> Affects Versions: 2.0.0
> Reporter: Grzegorz Chilkiewicz
> Priority: Trivial
>
> I have encountered a problem with SparkR presenting Spark vectors from
> org.apache.spark.mllib.linalg package
> * `head(df)` shows in vector column: "<environment: 0x2bd5d10>"
> * cast to string does not work as expected, it shows:
> "[1,null,null,org.apache.spark.sql.catalyst.expressions.UnsafeArrayData@79f50a91]"
> * `showDF(df)` work correctly
> to reproduce, start SparkR and paste following code (example taken from
> https://spark.apache.org/docs/latest/sparkr.html#naive-bayes-model)
> {code}
> # Fit a Bernoulli naive Bayes model with spark.naiveBayes
> titanic <- as.data.frame(Titanic)
> titanicDF <- createDataFrame(titanic[titanic$Freq > 0, -5])
> nbDF <- titanicDF
> nbTestDF <- titanicDF
> nbModel <- spark.naiveBayes(nbDF, Survived ~ Class + Sex + Age)
> # Model summary
> summary(nbModel)
> # Prediction
> nbPredictions <- predict(nbModel, nbTestDF)
> #########################################
> # My modification to expose the problem #
> nbPredictions$rawPrediction_str <- cast(nbPredictions$rawPrediction, "string")
> head(nbPredictions)
> showDF(nbPredictions)
> {code}
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