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From JG Perrin <>
Subject Joining 2 dataframes, getting result as nested list/structure in dataframe
Date Wed, 23 Aug 2017 18:30:04 GMT
Hi folks,

I am trying to join 2 dataframes, but I would like to have the result as a list of rows of
the right dataframe (dDf in the example) in a column of the left dataframe (cDf in the example).
I made it work with one column, but having issues adding more columns/creating a row(?).
    Seq<String> joinColumns = new Set2<>("c1", "c2").toSeq();
    Dataset<Row> allDf = cDf.join(dDf, joinColumns, "inner");

    Dataset<Row> aggDf = allDf.groupBy(cDf.col("c1"), cDf.col("c2"))

|c1      |c2     |collect_list(c50)          |
|    3744|1160242|         [6, 5, 4, 3, 2, 1]|
|    3739|1150097|                        [1]|
|    3780|1159902|            [5, 4, 3, 2, 1]|
|     132|1200743|               [4, 3, 2, 1]|
|    3778|1183204|                        [1]|
|    3766|1132709|                        [1]|
|    3835|1146169|                        [1]|



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