[jira] [Assigned] (SPARK-15216) Add a new Dataset API explainCodegen

["Apache Spark (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-15216?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-15216:
------------------------------------

    Assignee:     (was: Apache Spark)

> Add a new Dataset API explainCodegen
> ------------------------------------
>
>                 Key: SPARK-15216
>                 URL: https://issues.apache.org/jira/browse/SPARK-15216
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 2.0.0
>            Reporter: Xiao Li
>
> {noformat}
>     val ds = Seq("a" -> 1, "a" -> 3, "b" -> 3).toDS().groupByKey(_._1).agg(
>       expr("avg(_2)").as[Double],
>       ComplexResultAgg.toColumn)
>     ds.explainCodegen()
> {noformat}
> Reading codegen output is important for developers to debug. So far, outputting codegen results is available in the SQL interface by `EXPLAIN CODEGEN`. However, in the Dataset/DataFrame APIs, we face the same issue. We can add a new API for it.



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