columns
Creates names.size() columns with the provided names and data type
Return
a map with the column names all assigned the same data type
Parameters
names
the names for the columns, must not be null or empty
data
the data type to associated with each column
Creates n = numColumns of columns all with the same data type, with names C1, C2, ..., Cn
Return
a map with the column names all assigned the same data type
Parameters
num
the number of columns to make, must be greater than 0
data
the type of all the columns