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[SQL] Two DataFrame fixes.
- Removed DataFrame.apply for projection & filtering since they are extremely confusing. - Added implicits for RDD[Int], RDD[Long], and RDD[String] Author: Reynold Xin <rxin@databricks.com> Closes #4543 from rxin/df-cleanup and squashes the following commits: 81ec915 [Reynold Xin] [SQL] More DataFrame fixes.
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- sql/core/src/main/scala/org/apache/spark/sql/DataFrame.scala 11 additions, 28 deletionssql/core/src/main/scala/org/apache/spark/sql/DataFrame.scala
- sql/core/src/main/scala/org/apache/spark/sql/DataFrameImpl.scala 7 additions, 17 deletions...e/src/main/scala/org/apache/spark/sql/DataFrameImpl.scala
- sql/core/src/main/scala/org/apache/spark/sql/IncomputableColumn.scala 0 additions, 4 deletions.../main/scala/org/apache/spark/sql/IncomputableColumn.scala
- sql/core/src/main/scala/org/apache/spark/sql/SQLContext.scala 46 additions, 8 deletions...core/src/main/scala/org/apache/spark/sql/SQLContext.scala
- sql/core/src/test/scala/org/apache/spark/sql/DataFrameImplicitsSuite.scala 55 additions, 0 deletions.../scala/org/apache/spark/sql/DataFrameImplicitsSuite.scala
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