Github user yhuai commented on the pull request:
https://github.com/apache/spark/pull/7841#issuecomment-155661297
@aray This is very cool! Here are a few things I'd like to discuss.
1. Should we always ask users to provide pivot values?
2. For the type of pivot values, should we just use String? Or, we should
use Literal Column?
3. For the column name of a pivot aggregation column, should we always show
the aggregate function in a column name? (right now, we only show function name
if we have more than 1 aggregations)
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