Join two data frames. The columns of the joined frames must not overlap and their rows are aligned and transformed according to the specified join kind. When the index of both frames is ordered, it is possible to specify `lookup` in order to align indices from other frame to the indices of the main frame (typically, to find the nearest key with available value for a key). ## Parameters - `frame1` - First data frame (left) to be used in the joining - `frame2` - Other frame (right) to be joined with `frame1` - `kind` - Specifies the joining behavior on row indices. Use `JoinKind.Outer` and `JoinKind.Inner` to get the union and intersection of the row keys, respectively. Use `JoinKind.Left` and `JoinKind.Right` to use the current key of the left/right data frame. - `lookup` - When `kind` is `Left` or `Right` and the two frames have ordered row index, this parameter can be used to specify how to find value for a key when there is no exactly matching key or when there are missing values. [category:Joining, merging and zipping]

public static Frame<R, C> JoinAlign<R, C>(
	JoinKind kind,
	Lookup lookup,
	Frame<R, C> frame1,
	Frame<R, C> frame2
)