It looks like the latest version of data.table has changed the behavior of
list( ) inside of a join - is this behavior as expected? Has anyone reported or
encountered this change? It seems like a bug to me. I am using data.table
v1.9.2 in R 3.2.0 .
Thanks,
Shir Levkowitz
#-----------------------------------------------
library(data.table)
# dates
dt.dateEx <- data.table(date = as.character(seq(as.Date('2014-04-01'),
as.Date('2014-04-15'), by = 1)))
setkey(dt.dateEx, date)
# hours
dt.hrEx <- copy(dt.dateEx)
dt.hrEx <- dt.hrEx[, list(hour_beginning =0:23), by = list(dt = date)] # rep
x24 per date
setkey(dt.hrEx, dt, hour_beginning)
# as expected
dt.classEx[dt.dateEx][, list(dt, hour_beginning)]
# not expected outcome
dt.classEx[dt.dateEx, list(hour_beginning)]
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