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[SPARK-11739][SQL] clear the instantiated SQLContext
Currently, if the first SQLContext is not removed after stopping SparkContext, a SQLContext could set there forever. This patch make this more robust. Author: Davies Liu <davies@databricks.com> Closes #9706 from davies/clear_context.
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- sql/core/src/main/scala/org/apache/spark/sql/SQLContext.scala 11 additions, 6 deletions...core/src/main/scala/org/apache/spark/sql/SQLContext.scala
- sql/core/src/test/scala/org/apache/spark/sql/MultiSQLContextsSuite.scala 2 additions, 3 deletions...st/scala/org/apache/spark/sql/MultiSQLContextsSuite.scala
- sql/core/src/test/scala/org/apache/spark/sql/execution/ExchangeCoordinatorSuite.scala 1 addition, 1 deletion...apache/spark/sql/execution/ExchangeCoordinatorSuite.scala
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