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Wenchen Fan 4e42842e82 [SPARK-8164] transformExpressions should support nested expression sequence 
Currently we only support `Seq[Expression]`, we should handle cases like `Seq[Seq[Expression]]` so that we can remove the unnecessary `GroupExpression`.

Author: Wenchen Fan <cloud0fan@outlook.com>

Closes #6706 from cloud-fan/clean and squashes the following commits:

60a1193 [Wenchen Fan] support nested expression sequence and remove GroupExpression
2015-06-10 18:22:47 -07:00
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main [SPARK-8164] transformExpressions should support nested expression sequence 2015-06-10 18:22:47 -07:00
test [SPARK-8164] transformExpressions should support nested expression sequence 2015-06-10 18:22:47 -07:00