NewLag accepts variadic arguments to create a new Lag node: If 1 expression, use default values for [default] and [offset] If 2 expressions, use default value for [default] 3 input expression match to [child], [offset], and [default] arguments The offset is constrained to a non-negative integer expression.Literal.

NewLead accepts variadic arguments to create a new Lead node: If 1 expression, use default values for [default] and [offset] If 2 expressions, use default value for [default] 3 input expression match to [child], [offset], and [default] arguments The offset is constrained to a non-negative integer expression.Literal.