Minor Description
If I assign names to a DataFrame using the names() function, it allows the introduction of "-" characters that caused the filter() function to subsequently fail. I am unclear if other special characters cause similar problems.
Example:
sdfCar <- createDataFrame(sqlContext, mtcars)
names(sdfCar) <- c("mpg", "cyl", "disp", "hp", "drat", "wt", "qsec", "vs", "am", "gear", "carb-count") # note: carb renamed to carb-count
sdfCar3 <- filter(sdfCar, carb-count==4)
Above fails with error: failure: identifier expected carb-count==4. This logic appears to be assuming that the "-" in the column name is a minus sign.
I am unsure if the problem here is that "" is illegal in a column name, or if the filter function should be able to handle "" in a column name, but one or the other must be wrong.