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select k from (select key k, max(value) v from src group by k) t Author: Daoyuan Wang <daoyuan.wang@intel.com> Author: Michael Armbrust <michael@databricks.com> Closes #4415 from adrian-wang/groupprune and squashes the following commits: 5d2d8a3 [Daoyuan Wang] address Michael's comments 61f8ef7 [Daoyuan Wang] add a unit test 80ddcc6 [Daoyuan Wang] keep project b69d385 [Daoyuan Wang] add a prune rule for grouping set |
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