Some bug fixes and predict manual

library(PivotalR)
db.connect(port = 17526, dbname = 'madlib')

dat <- db.data.frame("abalone")

key(dat) <- 'id'

dat$grp <- dat$id %% 2

dt <- madlib.rpart(rings < 10 ~ length + diameter + shell | sex + grp, data = dat)

Failed because the C++ code of fill_row has some bug