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[SPARK-5709] [SQL] Add EXPLAIN support in DataFrame API for debugging purpose
Author: Cheng Hao <hao.cheng@intel.com> Closes #4496 from chenghao-intel/df_explain and squashes the following commits: 552aa58 [Cheng Hao] Add explain support for DF
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- sql/core/src/main/scala/org/apache/spark/sql/Column.scala 8 additions, 0 deletionssql/core/src/main/scala/org/apache/spark/sql/Column.scala
- sql/core/src/main/scala/org/apache/spark/sql/DataFrame.scala 6 additions, 0 deletionssql/core/src/main/scala/org/apache/spark/sql/DataFrame.scala
- sql/core/src/main/scala/org/apache/spark/sql/DataFrameImpl.scala 10 additions, 3 deletions...e/src/main/scala/org/apache/spark/sql/DataFrameImpl.scala
- sql/core/src/main/scala/org/apache/spark/sql/execution/commands.scala 5 additions, 2 deletions.../main/scala/org/apache/spark/sql/execution/commands.scala
- sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveQl.scala 3 additions, 5 deletions...ive/src/main/scala/org/apache/spark/sql/hive/HiveQl.scala
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