[jira] [Updated] (SPARK-26759) Arrow optimization in SparkR's interoperability

["Hyukjin Kwon (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-26759?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Hyukjin Kwon updated SPARK-26759:
---------------------------------
    Fix Version/s: 3.0.0

> Arrow optimization in SparkR's interoperability
> -----------------------------------------------
>
>                 Key: SPARK-26759
>                 URL: https://issues.apache.org/jira/browse/SPARK-26759
>             Project: Spark
>          Issue Type: Umbrella
>          Components: SparkR, SQL
>    Affects Versions: 3.0.0
>            Reporter: Hyukjin Kwon
>            Assignee: Hyukjin Kwon
>            Priority: Major
>              Labels: release-notes
>             Fix For: 3.0.0
>
>
> Arrow 0.12.0 is release and it contains R API. We could optimize Spark DaraFrame <> R DataFrame interoperability.
> For instance see the examples below:
>  - {{dapply}}
> {code:java}
>     df <- createDataFrame(mtcars)
>     collect(dapply(df,
>                    function(r.data.frame) {
>                      data.frame(r.data.frame$gear)
>                    },
>                    structType("gear long")))
>     {code}
>  - {{gapply}}
> {code:java}
>     df <- createDataFrame(mtcars)
>     collect(gapply(df,
>                    "gear",
>                    function(key, group) {
>                      data.frame(gear = key[[1]], disp = mean(group$disp) > group$disp)
>                    },
>                    structType("gear double, disp boolean")))
>     {code}
>  - R DataFrame -> Spark DataFrame
> {code:java}
>     createDataFrame(mtcars)
>     {code}
>  - Spark DataFrame -> R DataFrame
> {code:java}
>     collect(df)
>     head(df)
>     {code}
> Currently, some of communication path between R side and JVM side has to buffer the data and flush it at once due to ARROW-4512. I don't target to fix it under this umbrella.



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