Add two FExprs together, which corresponds to python operator
y are multi-column expressions, then they must have the
same number of columns, and the
+ operator will be applied to each
corresponding pair of columns. If either
y are single-column
while the other is multi-column, then the single-column expression
will be repeated to the same number of columns as its opponent.
The result of adding two columns with different stypes will have the following stype:
max(x.stype, y.stype, int32)if both columns are numeric (i.e. bool, int or float);
str64if at least one of the columns is a string. In this case the
+operator implements string concatenation, same as in Python.
The arguments must be either
FExprs, or expressions that can be
An expression that evaluates
x + y.