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## What changes were proposed in this pull request? This PR fixes `DataFrame.describe()` by forcing materialization to make the `Seq` serializable. Currently, `describe()` of DataFrame throws `Task not serializable` Spark exceptions when joining in Scala 2.10. ## How was this patch tested? Manual. (After building with Scala 2.10, test on `bin/spark-shell` and `bin/pyspark`.) Author: Dongjoon Hyun <dongjoon@apache.org> Closes #13900 from dongjoon-hyun/SPARK-16173. |
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