Fix sort with unused levels #273
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The code did not handle correctly the case when unused levels were present at the front. This seems to have become easier to trigger since the index vs. levels distinction was dropped.
bkamins
reviewed
May 19, 2020
src/array.jl
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| perm = sortperm(view(index, seen), order=ord) | ||
| nzcounts = counts[seen] | ||
| levs = eltype(v) >: Missing ? [missing; v.pool.valindex] : v.pool.valindex | ||
| sortedlevs = sort(Vector(view(levs, seen)), order=ord) |
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why not use? sort!(levs[seen], order=ord)
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We need a Vector to avoid calling ourselves and getting a stack overflow. But yes sort! should work.
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levs[seen] would create a new vector anyway - right? But this is minor I guess so it can stay as is.
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Actually there's a weird behavior which creates a CategoricalVector with logical indexing. Need to investigate that...
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This is so tricky that I ended up filing a design issue against Base: JuliaLang/julia#36106.
bkamins
reviewed
May 19, 2020
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The code did not handle correctly the case when unused levels were present at the front.
This seems to have become easier to trigger since the index vs. levels distinction was dropped.
Fixes #269.