Preliminayr change that would allow new aggregate functions to be defined (without changing existing behavior.) Also chaging the if statemen…
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Preliminayr change that would allow new aggregate functions to bedefined (without changing existing behavior.) Also chaging the ifstatement to check for "sum" when deciding whether or not to calculatethe sum is more clear. Add one more fix to make sure we don't try todo math on non-numerical data.
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