Github user jerryshao commented on the pull request:
https://github.com/apache/spark/pull/13266#issuecomment-221259849
Since you already did this copy&paste, why not copy this line `import
org.apache.spark.sql.{DataFrame, SparkSession}`? IMHO, I think it is too
trivial to fix. Also if you want to fix it, I guess other examples also might
have such explicit type declaration, why not do a whole fix?
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