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Support aggregate functions.
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Added planner.groupBy which analyzes looks for any aggregate functions
in the select targets. If an aggregate function is found, we check to
make sure the select targets are valid and then rewrite the scanNode so
that it outputs the argument expressions for the aggregates.

Fixes #2043.
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@petermattis
petermattis committed Aug 22, 2015
1 parent 54f54b4 commit 208492a
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