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[SQL][DataFrame] Fix column computability bug.
Do not recursively strip out projects. Only strip the first level project.
```scala
df("colA") + df("colB").as("colC")
```
Previously, the above would construct an invalid plan.
Author: Reynold Xin <rxin@databricks.com>
Closes #4519 from rxin/computability and squashes the following commits:
87ff763 [Reynold Xin] Code review feedback.
015c4fc [Reynold Xin] [SQL][DataFrame] Fix column computability.
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- mllib/src/main/scala/org/apache/spark/mllib/recommendation/MatrixFactorizationModel.scala 1 addition, 1 deletion...spark/mllib/recommendation/MatrixFactorizationModel.scala
- sql/core/src/main/scala/org/apache/spark/sql/Column.scala 26 additions, 9 deletionssql/core/src/main/scala/org/apache/spark/sql/Column.scala
- sql/core/src/main/scala/org/apache/spark/sql/SQLContext.scala 2 additions, 2 deletions...core/src/main/scala/org/apache/spark/sql/SQLContext.scala
- sql/core/src/test/scala/org/apache/spark/sql/ColumnExpressionSuite.scala 10 additions, 3 deletions...st/scala/org/apache/spark/sql/ColumnExpressionSuite.scala
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