Github user dongjoon-hyun commented on the issue:
https://github.com/apache/spark/pull/13520
Thank you for review, @rxin and @srowen .
The main rational of this PR is to make `SparkSession` explicitly as a
starting point for the operations in these examples. (Instead of SparkContext,
sc).
`Spark` uses natually `'.'` to make a long sequence of operations, i.e,
`sc.parallelize().map().reduce()` or
`spark.createDataFrame().toDF().stat.crosstab().show()`. And, before
`SparkSession`, the starting points were `SparkContext` and
`Dataset/Dataframe/RDD`.
This PR tried to treat `SparkSession` and `Dataset/Dataframe/RDD` as the
starting points in these examples and didn't touch other examples which `sc` is
repeated a lot.
The other things like replacing `var` with `val` are irrelevant. I can
revert them.
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