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

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#4309
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Confusing error message when trying to group by a list column#4308
#4309
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non-atomic columne.g. list columns, S4 vector columns
Milestone
1.15.0

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@sindribaldur
sindribaldur
opened on Mar 19, 2020
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 Do not quote column names.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"Do not quote column names" seems out of place.

Activity

  1. 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[/+] on Mar 20, 2020
  2. jangorecki
    added
    non-atomic columne.g. list columns, S4 vector columns
    on Apr 5, 2020
  3. mattdowle
    added this to the 1.14.1 milestone on Jun 14, 2021
  4. mattdowle
    closed this as completedin #4309on Jun 14, 2021
  5. jangorecki
    modified the milestones: 1.14.9, 1.15.0 on Oct 29, 2023
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