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Commit 2cbb3e43 authored by Daoyuan Wang's avatar Daoyuan Wang Committed by Michael Armbrust
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[SPARK-5642] [SQL] Apply column pruning on unused aggregation fields

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
parent 5d3cc6b3
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