[datatable-help] Crash when assigning column.

[statquant3]

As Matthew is saying, I am using v.1.8.7 (lattest release)
I get a warning:

R>   test.dt[, tc := which(name==order), by=list(ID, name)]
Warning message:
In `[.data.table`(test.dt, , `:=`(tc, which(name == order)), by = list(ID, 
:
  Invalid .internal.selfref detected and fixed by taking a copy of the whole
table, so that := can add this new column by reference. At an earlier point,
this data.table has been copied by R. Avoid key<-, names<- and attr<- which
in R currently (and oddly) may copy the whole data.table. Use set* syntax
instead to avoid copying: setkey(), setnames() and setattr(). Also,
list(DT1,DT2) will copy the entire DT1 and DT2 (R's list() copies named
objects), use reflist() instead if needed (to be implemented). If this
message doesn't help, please report to datatable-help so the root cause can
be fixed.




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