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Select is not selecting in the same order #2986

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privefl opened this issue Jul 26, 2018 · 3 comments
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Select is not selecting in the same order #2986

privefl opened this issue Jul 26, 2018 · 3 comments
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@privefl
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privefl commented Jul 26, 2018

When selecting c(5, 1, 3) from a file containing iris, I expected to have Species first.

> library(data.table)

> fwrite(iris, tmp <- tempfile())

> fread(file = tmp, select = c(5, 1, 3), skip = 0)
     Petal.Length   Species Sepal.Length
  1:          1.4    setosa          5.1
  2:          1.4    setosa          4.9
  3:          1.3    setosa          4.7
  4:          1.5    setosa          4.6
  5:          1.4    setosa          5.0
 ---                                    
146:          5.2 virginica          6.7
147:          5.0 virginica          6.3
148:          5.2 virginica          6.5
149:          5.4 virginica          6.2
150:          5.1 virginica          5.9

> fread(file = tmp, select = c(5, 1, 3), skip = 1)
      V3        V5  V1
  1: 1.4    setosa 5.1
  2: 1.4    setosa 4.9
  3: 1.3    setosa 4.7
  4: 1.5    setosa 4.6
  5: 1.4    setosa 5.0
 ---                  
146: 5.2 virginica 6.7
147: 5.0 virginica 6.3
148: 5.2 virginica 6.5
149: 5.4 virginica 6.2
150: 5.1 virginica 5.9
@MichaelChirico
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Hmm, I thought this was an issue that was closed already...

@MichaelChirico
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Yes, #1445. The examples in that issue work as expected...

@MichaelChirico
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Hmm, I think maybe the code is broken. I guess order(select) should be replaced by frank(select).

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