lisa.stats: Do not use unit column for aggregation
The columns to aggregate can be auto-detected. Make sure the unit column is not taken as part of it, as it will confuse some methods that expect the unit to not be part of the aggregation column.
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The columns to aggregate can be auto-detected. Make sure the unit column is not taken as part of it, as it will confuse some methods that expect the unit to not be part of the aggregation column.