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Confusing error message when trying to group by a list column #4308

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sindribaldur opened this issue Mar 19, 2020 · 0 comments · Fixed by #4309
Closed

Confusing error message when trying to group by a list column #4308

sindribaldur opened this issue Mar 19, 2020 · 0 comments · Fixed by #4309
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non-atomic column
Milestone
1.14.9

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@sindribaldur
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sindribaldur commented Mar 19, 2020 •
edited 

iis <- data.table(iris)
iis[, letts := .(list(sample(letters[1:4], size = 2))), 1:nrow(iris)]
iis[, .N, .(Species, letts)]

Error in `[.data.table`(iis, , .N, .(Species, letts)) : 
  column or expression 2 of 'by' or 'keyby' is type list. Do not quote column names. Usage: DT[,sum(colC),by=list(colA,month(colB))]

"Do not quote column names" seems out of place.
@MichaelChirico MichaelChirico mentioned this issue Mar 19, 2020
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@sindribaldur sindribaldur changed the title Cofnusing error message when trying to group by a list column Confusing error message when trying to group by a list column Mar 20, 2020
@mattdowle mattdowle added this to the 1.14.1 milestone Jun 14, 2021
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non-atomic column
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expand & improve error message for grouping by unsupported types Rdatatable/data.table
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@mattdowle @jangorecki @sindribaldur