9dcf4f78f4
Address marmbrus and scwf's comments in #5604.
Author: Yin Huai <yhuai@databricks.com>
Closes #5945 from yhuai/windowFollowup and squashes the following commits:
0ef879d [Yin Huai] Add collectFirst to TreeNode.
2373968 [Yin Huai] wip
4a16df9 [Yin Huai] Address minor comments for [SPARK-1442].
(cherry picked from commit
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