Github user rxin commented on the pull request:
https://github.com/apache/spark/pull/1211#issuecomment-47168498
I thought about this more ('key.avg vs avg('key)), and IMHO the latter
(avg('key)) is more natural. It matches nicely with what users write in SQL
already. It also delivers the subtle message that 'key here is a cell (more
precisely, the key attribute in each row) rather than a whole column.
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