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[SPARK-15135][SQL] Make sure SparkSession thread safe
## What changes were proposed in this pull request? Went through SparkSession and its members and fixed non-thread-safe classes used by SparkSession ## How was this patch tested? Existing unit tests Author: Shixiong Zhu <shixiong@databricks.com> Closes #12915 from zsxwing/spark-session-thread-safe.
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- sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/FunctionRegistry.scala 7 additions, 3 deletions...apache/spark/sql/catalyst/analysis/FunctionRegistry.scala
- sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/InMemoryCatalog.scala 1 addition, 1 deletion...g/apache/spark/sql/catalyst/catalog/InMemoryCatalog.scala
- sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/SessionCatalog.scala 56 additions, 46 deletions...rg/apache/spark/sql/catalyst/catalog/SessionCatalog.scala
- sql/core/src/main/scala/org/apache/spark/sql/ExperimentalMethods.scala 2 additions, 2 deletions...main/scala/org/apache/spark/sql/ExperimentalMethods.scala
- sql/core/src/main/scala/org/apache/spark/sql/SparkSession.scala 5 additions, 2 deletions...re/src/main/scala/org/apache/spark/sql/SparkSession.scala
- sql/hive/src/main/scala/org/apache/spark/sql/hive/test/TestHive.scala 2 additions, 2 deletions.../main/scala/org/apache/spark/sql/hive/test/TestHive.scala
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