Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/16856
several questions:
1. as `SparkSession` becomes the new entry point, now we require users to
include spark-sql module in their sbt file or pom.xml, which seems weird if
users only want to write a very simple spark application without SQL
functionality. Shall we rename spark-sql to a more general name like
`spark-structure`?
2. when it comes to java application with RDD, it's inconvenient to build
`SparkSession` and then create `JavaSparkContext`, users can create
`JavaSparkContext` directly.
cc @rxin @yhuai
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