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Kyle McCarthyAndy Grove
9acd0f4d164
Kyle McCarthy authored and Andy Grove committed bd488e7a6bf
ARROW-6659: [Rust] [DataFusion] Refactor of HashAggregateExec to support custom merge

Issue: https://issues.apache.org/jira/browse/ARROW-6659

Closes #5648 from kyle-mccarthy/ARROW-6659 and squashes the following commits:

1cb49299c <Kyle McCarthy> Merge branch 'master' of github.com:kyle-mccarthy/arrow into ARROW-6659
191e025ad <Kyle McCarthy> refactor: return the physical plan early if an aggregate contains a single partition
83ed6f1e9 <Kyle McCarthy> fix: resolve build issues
9c591e7c8 <Kyle McCarthy> refactor: clean up code merging hash aggr
b376ff9b1 <Kyle McCarthy> merge
3596cf417 <Kyle McCarthy> refactor: move logic from HashAggregateExec into physical query planner

Authored-by: Kyle McCarthy <kyle@creativeanvil.com>
Signed-off-by: Andy Grove <andygrove73@gmail.com>