[SPARK-11672] [ML] Set active SQLContext in MLlibTestSparkContext.beforeAll #9694
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Still saw some error messages caused by
SQLContext.getOrCreate:https://amplab.cs.berkeley.edu/jenkins/job/Spark-Master-SBT/3997/AMPLAB_JENKINS_BUILD_PROFILE=hadoop2.3,label=spark-test/testReport/junit/org.apache.spark.ml.util/JavaDefaultReadWriteSuite/testDefaultReadWrite/
This PR sets the active SQLContext in beforeAll, which is not automatically set in
new SQLContext. This makesSQLContext.getOrCreatereturn the right SQLContext.cc: @yhuai