[R-Forge #5366] setkey fails in 1.9.2 when a non-key column is type list

[arunsrinivasan]

Submitted by: James Sams; Assigned to: Arun ; R-Forge link

System: R 3.0.1 on Ubuntu 13.10; Xeon x64; data.table 1.8.11

I am occasionally getting an error when setting keys or doing operations that requires resetting the key on some data.tables. I haven't been able to produce an artificial test case for you to run. The keys I specify are both integers. The error message is:

# Error in setkeyv(copy(x), by) : Item 5 of list is not a vector". 

I get this when using merge( , , by=c('key', 'names')), setkey(..), and setkeyv(..).

Not all tables produce this error message, but once a table starts producing it; it seem to consistently fail.

I do not see this problem in 1.8.10.