[SPARK-15031] Use SparkSession in Scala/Python/Java example.

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.0.0
• Component/s: Examples
• Target Version/s: 2.0.0
• Assignee: Dongjoon Hyun
• Reporter: Dongjoon Hyun
• Created: 30/Apr/16 07:13
• Updated: 18/May/16 07:40
• Resolved: 04/May/16 21:34

Description

This PR aims to update Scala/Python/Java examples by replacing `SQLContext` with newly added `SparkSession`.

• Use SparkSession Builder Pattern in 154(Scala 55, Java 52, Python 47) files.
• Add `getConf` in Python `SparkContext` class: python/pyspark/context.py
• Replace SQLContext Singleton Pattern with SparkSession Singleton Pattern:
• `SqlNetworkWordCount.scala`
• `JavaSqlNetworkWordCount.java`
• `sql_network_wordcount.py`

Now, `SQLContexts` are used only in R examples and the following two Python examples. The python examples are untouched in this PR since it already fails some unknown issue.

• `simple_params_example.py`
• `aft_survival_regression.py`

Issue Links

• is blocked by: SPARK-15052 Use builder pattern to create SparkSession
• links to: [Github] Pull Request #12809 (dongjoon-hyun)
• links to: [Github] Pull Request #13050 (zhengruifeng)
• links to: [Github] Pull Request #13135 (HyukjinKwon)
• links to: [Github] Pull Request #13164 (zhengruifeng)