filter from dplyr plus nested setDT renders index invalid
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Assessment
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Newbie friendliness
- 48/100
Research direction
Start by running the reproducible R example from the issue with data.table, dplyr::filter, setDT, and the existing index on column a. Trace the nested setDT call and the subsequent x[a == "b"] lookup to identify where the index becomes invalid. Done means the example no longer raises the internal getindex error while retaining the expected filtered result.
Written by the indexing model from the issue text.
Description
If we remove setDT from f there will be no error anymore
dt = data.table(a = c("b","a","c"), v = 1:3)
dt[a == "a"] ## creates index
f = function(x) {
setDT(x)
x[a == "b"]
}
f(
dplyr::filter(dt, a != "a")
)
#Error: Internal error in getindex: index 'a' exists but is invalid. Please report to the data.table issues tracker.
1.17.8
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