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Andy Grove
56d5d23cf41
Andy Grove authored f9e21ae16ff
ARROW-4596: [Rust] [DataFusion] Implement COUNT

This builds on https://github.com/apache/arrow/pull/4035 to implement COUNT. I based this on work done by @LukeMathWalker in https://github.com/apache/arrow/pull/4020

Author: Andy Grove <andygrove73@gmail.com>

Closes #4036 from andygrove/count and squashes the following commits:

612c963a <Andy Grove> Address PR feedback
84716528 <Andy Grove> Address PR feedback
cc55c273 <Andy Grove> revert change
f2f92769 <Andy Grove> Fix typo in comments
d63b98a1 <Andy Grove> Fix bug in SQL query planner where COUNT(1) was being translated incorrectly
611305b0 <Andy Grove> Add better documentation for AggregateFunction
f580a146 <Andy Grove> Implement COUNT
29a7778a <Andy Grove> Implement COUNT