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[SPARK-4410][SQL] Add support for external sort
Adds a new operator that uses Spark's `ExternalSort` class. It is off by default now, but we might consider making it the default if benchmarks show that it does not regress performance. Author: Michael Armbrust <michael@databricks.com> Closes #3268 from marmbrus/externalSort and squashes the following commits: 48b9726 [Michael Armbrust] comments b98799d [Michael Armbrust] Add test afd7562 [Michael Armbrust] Add support for external sort.
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- sql/core/src/main/scala/org/apache/spark/sql/SQLConf.scala 7 additions, 0 deletionssql/core/src/main/scala/org/apache/spark/sql/SQLConf.scala
- sql/core/src/main/scala/org/apache/spark/sql/execution/SparkStrategies.scala 4 additions, 1 deletion...cala/org/apache/spark/sql/execution/SparkStrategies.scala
- sql/core/src/main/scala/org/apache/spark/sql/execution/basicOperators.scala 33 additions, 4 deletions...scala/org/apache/spark/sql/execution/basicOperators.scala
- sql/core/src/test/scala/org/apache/spark/sql/SQLQuerySuite.scala 15 additions, 1 deletion...e/src/test/scala/org/apache/spark/sql/SQLQuerySuite.scala
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