Thanks Michael – this is a great article… very helpful From: Michael Armbrust [mailto:mich...@databricks.com] Sent: Wednesday, August 23, 2017 4:33 PM To: JG Perrin <jper...@lumeris.com> Cc: user@spark.apache.org Subject: Re: Joining 2 dataframes, getting result as nested list/structure in dataframe
You can create a nested struct that contains multiple columns using struct(). Here's a pretty complete guide on working with nested data: https://databricks.com/blog/2017/02/23/working-complex-data-formats-structured-streaming-apache-spark-2-1.html On Wed, Aug 23, 2017 at 2:30 PM, JG Perrin <jper...@lumeris.com<mailto:jper...@lumeris.com>> wrote: 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"); allDf.printSchema(); allDf.show(); Dataset<Row> aggDf = allDf.groupBy(cDf.col("c1"), cDf.col("c2")) .agg(collect_list(col("c50"))); aggDf.show(); Output: +--------+-------+---------------------------+ |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]| +--------+-------+---------------------------+ Thanks, jg ________________________________ This electronic transmission and any documents accompanying this electronic transmission contain confidential information belonging to the sender. This information may contain confidential health information that is legally privileged. The information is intended only for the use of the individual or entity named above. The authorized recipient of this transmission is prohibited from disclosing this information to any other party unless required to do so by law or regulation and is required to delete or destroy the information after its stated need has been fulfilled. If you are not the intended recipient, you are hereby notified that any disclosure, copying, distribution or the taking of any action in reliance on or regarding the contents of this electronically transmitted information is strictly prohibited. If you have received this E-mail in error, please notify the sender and delete this message immediately.
