Mutates the data frame by adding an additional data series as a new column with the specified column key. The operation uses left join and aligns new series to the existing frame keys. A parameter `lookup` can be used to specify how to find a value in the added series (if an exact key is not available). The `lookup` parameter can only be used with ordered indices. ## Parameters - `series` - A data series to be added (the row key type has to match) - `column` - A key (or name) for the newly added column - `lookup` - Specify how to find value in the added series (look for nearest available value with the smaller/greater key). [category:Series operations]

public void AddColumn<V>(
	TColumnKey column,
	ISeries<TRowKey> series,
	Lookup lookup
)