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[SPARK-13643][SQL] Implement SparkSession
## What changes were proposed in this pull request? After removing most of `HiveContext` in 8fc267ab we can now move existing functionality in `SQLContext` to `SparkSession`. As of this PR `SQLContext` becomes a simple wrapper that has a `SparkSession` and delegates all functionality to it. ## How was this patch tested? Jenkins. Author: Andrew Or <andrew@databricks.com> Closes #12553 from andrewor14/implement-spark-session.
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- project/MimaExcludes.scala 3 additions, 0 deletionsproject/MimaExcludes.scala
- sql/core/src/main/scala/org/apache/spark/sql/SQLContext.scala 81 additions, 173 deletions...core/src/main/scala/org/apache/spark/sql/SQLContext.scala
- sql/core/src/main/scala/org/apache/spark/sql/SparkSession.scala 851 additions, 11 deletions...re/src/main/scala/org/apache/spark/sql/SparkSession.scala
- sql/core/src/main/scala/org/apache/spark/sql/execution/command/resources.scala 1 addition, 1 deletion...la/org/apache/spark/sql/execution/command/resources.scala
- sql/core/src/main/scala/org/apache/spark/sql/internal/SessionState.scala 3 additions, 1 deletion...in/scala/org/apache/spark/sql/internal/SessionState.scala
- sql/core/src/test/scala/org/apache/spark/sql/test/TestSQLContext.scala 25 additions, 11 deletions...test/scala/org/apache/spark/sql/test/TestSQLContext.scala
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