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[SPARK-20946][SQL] Do not update conf for existing SparkContext in SparkSession.getOrCreate
## What changes were proposed in this pull request? SparkContext is shared by all sessions, we should not update its conf for only one session. ## How was this patch tested? existing tests Author: Wenchen Fan <wenchen@databricks.com> Closes #18536 from cloud-fan/config.
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- mllib/src/test/scala/org/apache/spark/ml/recommendation/ALSSuite.scala 1 addition, 3 deletions...t/scala/org/apache/spark/ml/recommendation/ALSSuite.scala
- mllib/src/test/scala/org/apache/spark/ml/tree/impl/TreeTests.scala 0 additions, 2 deletions.../test/scala/org/apache/spark/ml/tree/impl/TreeTests.scala
- sql/core/src/main/scala/org/apache/spark/sql/SparkSession.scala 7 additions, 12 deletions...re/src/main/scala/org/apache/spark/sql/SparkSession.scala
- sql/core/src/test/scala/org/apache/spark/sql/SparkSessionBuilderSuite.scala 3 additions, 5 deletions...scala/org/apache/spark/sql/SparkSessionBuilderSuite.scala
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