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[SPARK-10743][SQL] keep the name of expression if possible when do cast
Author: Wenchen Fan <cloud0fan@163.com> Closes #8859 from cloud-fan/cast.
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- sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala 16 additions, 17 deletions...ala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
- sql/core/src/main/scala/org/apache/spark/sql/Column.scala 2 additions, 2 deletionssql/core/src/main/scala/org/apache/spark/sql/Column.scala
- sql/core/src/test/scala/org/apache/spark/sql/ColumnExpressionSuite.scala 0 additions, 6 deletions...st/scala/org/apache/spark/sql/ColumnExpressionSuite.scala
- sql/core/src/test/scala/org/apache/spark/sql/DataFrameSuite.scala 5 additions, 0 deletions.../src/test/scala/org/apache/spark/sql/DataFrameSuite.scala
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