Select do not rename variable with data.table

[cderv]

Hi,

"select() is substantially more powerful. You can use named arguments to rename existing variables"

I tried to use this new functionality. It work with data.frame or tbl_df but don't work with tbl_dt or or data.table. Is this an issue or just no compatibility between dplyr and data.table?

EXAMPLE

data.dt<-data.table(Col1=1:4,Col2=letters[1:4])
data.df<-data.frame(Col1=1:4,Col2=letters[1:4])

 select(data.df,Col1,NewCol2=Col2)

#  Col1 NewCol2
#1    1       a
#2    2       b
#3    3       c
#4    4       d

==> It worked

select(data.dt,Col1,NewCol2=Col2)
#   Col1 Col2
#1:    1    a
#2:    2    b
#3:    3    c
#4:    4    d

==> Do not work

select(tbl_df(data.df),Col1,NewCol2=Col2)
#Source: local data frame [4 x 2]
#
#  Col1 NewCol2
#1    1       a
#2    2       b
#3    3       c
#4    4       d

==> It worked

select(tbl_dt(data.dt),Col1,NewCol2=Col2)
#Source:     local data table [4 x 2]
#
#  Col1 Col2
#1    1    a
#2    2    b
#3    3    c
#4    4    d

==> Do not work

Christophe