pyspark sqlcontext from sparkSessopn code example
Example 1: create pyspark session with hive support
from pyspark.sql import SparkSession
spark = SparkSession.builder.master("yarn").appName("my app").enableHiveSupport().getOrCreate()
Example 2: Gets an existing SparkSession or, if there is no existing one, creates a new
s1 = SparkSession.builder.config("k1", "v1").getOrCreate()
s1.conf.get("k1") == s1.sparkContext.getConf().get("k1") == "v1"
s2 = SparkSession.builder.config("k2", "v2").getOrCreate()
s1.conf.get("k1") == s2.conf.get("k1")
s1.conf.get("k2") == s2.conf.get("k2")