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[SPARK-5985][SQL] DataFrame sortBy -> orderBy in Python.
Also added desc/asc function for constructing sorting expressions more conveniently. And added a small fix to lift alias out of cast expression. Author: Reynold Xin <rxin@databricks.com> Closes #4752 from rxin/SPARK-5985 and squashes the following commits: aeda5ae [Reynold Xin] Added Experimental flag to ColumnName. 047ad03 [Reynold Xin] Lift alias out of cast. c9cf17c [Reynold Xin] [SPARK-5985][SQL] DataFrame sortBy -> orderBy in Python.
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- python/pyspark/sql/dataframe.py 8 additions, 3 deletionspython/pyspark/sql/dataframe.py
- python/pyspark/sql/functions.py 3 additions, 0 deletionspython/pyspark/sql/functions.py
- sql/core/src/main/scala/org/apache/spark/sql/Column.scala 11 additions, 2 deletionssql/core/src/main/scala/org/apache/spark/sql/Column.scala
- sql/core/src/main/scala/org/apache/spark/sql/functions.scala 29 additions, 0 deletionssql/core/src/main/scala/org/apache/spark/sql/functions.scala
- sql/core/src/test/scala/org/apache/spark/sql/ColumnExpressionSuite.scala 4 additions, 0 deletions...st/scala/org/apache/spark/sql/ColumnExpressionSuite.scala
- sql/core/src/test/scala/org/apache/spark/sql/DataFrameSuite.scala 4 additions, 0 deletions.../src/test/scala/org/apache/spark/sql/DataFrameSuite.scala
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