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[SQL] Support df("*") to select all columns in a data frame.
This PR makes Star a trait, and provides two implementations: UnresolvedStar (used for *, tblName.*) and ResolvedStar (used for df("*")).
Author: Reynold Xin <rxin@databricks.com>
Closes #4283 from rxin/df-star and squashes the following commits:
c9cba3e [Reynold Xin] Removed mapFunction in UnresolvedStar.
1a3a1d7 [Reynold Xin] [SQL] Support df("*") to select all columns in a data frame.
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- sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/SqlParser.scala 1 addition, 1 deletion.../main/scala/org/apache/spark/sql/catalyst/SqlParser.scala
- sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/unresolved.scala 36 additions, 17 deletions...a/org/apache/spark/sql/catalyst/analysis/unresolved.scala
- sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/analysis/AnalysisSuite.scala 3 additions, 1 deletion...rg/apache/spark/sql/catalyst/analysis/AnalysisSuite.scala
- sql/core/src/main/scala/org/apache/spark/sql/Column.scala 3 additions, 3 deletionssql/core/src/main/scala/org/apache/spark/sql/Column.scala
- sql/core/src/main/scala/org/apache/spark/sql/DataFrame.scala 2 additions, 2 deletionssql/core/src/main/scala/org/apache/spark/sql/DataFrame.scala
- sql/core/src/test/scala/org/apache/spark/sql/ColumnExpressionSuite.scala 6 additions, 2 deletions...st/scala/org/apache/spark/sql/ColumnExpressionSuite.scala
- sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveQl.scala 3 additions, 3 deletions...ive/src/main/scala/org/apache/spark/sql/hive/HiveQl.scala
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