[datatable-help] Bug in merge for data.table?

[Joseph Voelkel]

Consider the following code. It seems like the errors that occur when y only has a key column is a bug. Yes?

DT<-data.table(a=rep(1:2,each=3),b=1:6,key="a")

y<-J(a=c(0,1),bb=c(10,11),key="a") # y, with key column and one more column
merge(y,DT) # fine
merge(y,DT,all=TRUE) # fine

y<-J(a=c(0,1),key="a") # y with only a key column
merge(y,DT) # fine
merge(y,DT,all=TRUE) # error
merge(DT,y,all=TRUE) # a different error

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